chrome/android/java/src/org/chromium/chrome/browser/widget/GridTabSwitcherLayout.java - chromium/src - Git at Google

 // Copyright 2019 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.chrome.browser.widget;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.content.Context;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.os.SystemClock;

 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 import org.chromium.base.Supplier;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.ChromeVersionInfo;
 import org.chromium.chrome.browser.compositor.LayerTitleCache;
 import org.chromium.chrome.browser.compositor.animation.CompositorAnimationHandler;
 import org.chromium.chrome.browser.compositor.animation.CompositorAnimator;
 import org.chromium.chrome.browser.compositor.layouts.Layout;
 import org.chromium.chrome.browser.compositor.layouts.LayoutRenderHost;
 import org.chromium.chrome.browser.compositor.layouts.LayoutUpdateHost;
 import org.chromium.chrome.browser.compositor.layouts.components.LayoutTab;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
 import org.chromium.chrome.browser.compositor.layouts.eventfilter.EventFilter;
 import org.chromium.chrome.browser.compositor.scene_layer.SceneLayer;
 import org.chromium.chrome.browser.compositor.scene_layer.TabListSceneLayer;
 import org.chromium.chrome.browser.fullscreen.ChromeFullscreenManager;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tasks.tab_management.GridTabSwitcher;
 import org.chromium.ui.interpolators.BakedBezierInterpolator;
 import org.chromium.ui.resources.ResourceManager;
 import org.chromium.ui.widget.Toast;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Locale;

 /**
  * A {@link Layout} that shows all tabs in one grid view.
  */
 public class GridTabSwitcherLayout
         extends Layout implements GridTabSwitcher.GridVisibilityObserver {
     private static final String TAG = "GTSLayout";

     // Duration of the transition animation
     @VisibleForTesting
     static final long ZOOMING_DURATION = 300;

     /** Field trial parameter for whether skipping slow zooming animation */
     private static final String SKIP_SLOW_ZOOMING_PARAM = "skip-slow-zooming";
     private static final boolean DEFAULT_SKIP_SLOW_ZOOMING = false;

     // The transition animation from a tab to the tab switcher.
     private AnimatorSet mTabToSwitcherAnimation;

     private final TabListSceneLayer mSceneLayer = new TabListSceneLayer();
     private final GridTabSwitcher mGridTabSwitcher;
     private final GridTabSwitcher.GridController mGridController;
     // To force Toolbar finishes its animation when this Layout finished hiding.
     private final LayoutTab mDummyLayoutTab;

     private int mFrameCount;
     private long mStartTime;
     private long mLastFrameTime;
     private long mMaxFrameInterval;
     private int mStartFrame;

     interface PerfListener {
         void onAnimationDone(
                 int frameRendered, long elapsedMs, long maxFrameInterval, int dirtySpan);
     }

     private PerfListener mPerfListenerForTesting;

     public GridTabSwitcherLayout(Context context, LayoutUpdateHost updateHost,
             LayoutRenderHost renderHost, GridTabSwitcher gridTabSwitcher) {
         super(context, updateHost, renderHost);
         mDummyLayoutTab = createLayoutTab(Tab.INVALID_TAB_ID, false, false, false);
         mDummyLayoutTab.setShowToolbar(true);
         mGridTabSwitcher = gridTabSwitcher;
         mGridController = gridTabSwitcher.getGridController();
         mGridController.addOverviewModeObserver(this);
     }

     @Override
     public LayoutTab getLayoutTab(int id) {
         return mDummyLayoutTab;
     }

     @Override
     public void destroy() {
         if (mGridController != null) {
             mGridController.removeOverviewModeObserver(this);
         }
     }

     @Override
     public void show(long time, boolean animate) {
         super.show(time, animate);

         boolean showShrinkingAnimation =
                 animate && ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION);
         boolean quick = mGridTabSwitcher.prepareOverview();
         if (getSkipSlowZooming()) {
             showShrinkingAnimation &= quick;
         }

         if (!showShrinkingAnimation) {
             // Keep the current tab in mLayoutTabs so that thumbnail taking is not blocked.
             LayoutTab sourceLayoutTab = createLayoutTab(mTabModelSelector.getCurrentTabId(),
                     mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NEED_TITLE);
             mLayoutTabs = new LayoutTab[] {sourceLayoutTab};

             mGridController.showOverview(animate);
             return;
         }

         shrinkTab(() -> mGridTabSwitcher.getThumbnailLocationOfCurrentTab(false));
     }

     @Override
     protected void updateLayout(long time, long dt) {
         super.updateLayout(time, dt);
         if (mLayoutTabs == null) return;

         assert mLayoutTabs.length == 1;
         boolean needUpdate = mLayoutTabs[0].updateSnap(dt);
         if (needUpdate) requestUpdate();
     }

     @Override
     public boolean onBackPressed() {
         if (mTabModelSelector.getCurrentModel().getCount() == 0) return false;

         if (mGridController.overviewVisible()) {
             mGridController.hideOverview(true);
             return true;
         }

         return false;
     }

     @Override
     protected EventFilter getEventFilter() {
         return null;
     }

     @Override
     protected SceneLayer getSceneLayer() {
         return mSceneLayer;
     }

     @Override
     public boolean handlesTabClosing() {
         return true;
     }

     @Override
     public boolean handlesTabCreating() {
         return true;
     }

     @Override
     public boolean handlesCloseAll() {
         return false;
     }

     // GridTabSwitcher.GridVisibilityObserver implementation.
     @Override
     public void onOverviewModeStartedShowing(boolean showToolbar) {}

     @Override
     public void onOverviewModeFinishedShowing() {
         doneShowing();
         Tab currentTab = mTabModelSelector.getCurrentTab();
         if (currentTab != null) mTabContentManager.cacheTabThumbnail(currentTab);
     }

     @Override
     public void onOverviewModeStartedHiding(boolean showToolbar, boolean delayAnimation) {
         startHiding(mTabModelSelector.getCurrentTabId(), false);
         if (!ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION)) {
             mGridTabSwitcher.postHiding();
             return;
         }
         expandTab(mGridTabSwitcher.getThumbnailLocationOfCurrentTab(true));
     }

     @Override
     public void onOverviewModeFinishedHiding() {}

     @Override
     protected void forceAnimationToFinish() {
         super.forceAnimationToFinish();
         if (mTabToSwitcherAnimation != null) {
             if (mTabToSwitcherAnimation.isRunning()) mTabToSwitcherAnimation.end();
         }
     }

     /**
      * Animate shrinking a tab to a target {@link Rect} area.
      * @param target The target {@link Rect} area.
      */
     private void shrinkTab(Supplier<Rect> target) {
         LayoutTab sourceLayoutTab = createLayoutTab(mTabModelSelector.getCurrentTabId(),
                 mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NEED_TITLE);

         mLayoutTabs = new LayoutTab[] {sourceLayoutTab};

         forceAnimationToFinish();

         CompositorAnimationHandler handler = getAnimationHandler();
         Collection<Animator> animationList = new ArrayList<>(5);

         // Step 1: zoom out the source tab
         animationList.add(CompositorAnimator.ofFloatProperty(
                 handler, sourceLayoutTab, LayoutTab.SCALE, () -> 1f, () -> {
                     return target.get().width() / (getWidth() * mDpToPx);
                 }, ZOOMING_DURATION));
         animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab, LayoutTab.X,
                 () -> 0f, () -> { return target.get().left / mDpToPx; }, ZOOMING_DURATION));
         animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab, LayoutTab.Y,
                 () -> 0f, () -> { return target.get().top / mDpToPx; }, ZOOMING_DURATION));
         animationList.add(CompositorAnimator.ofFloatProperty(
                 handler, sourceLayoutTab, LayoutTab.DECORATION_ALPHA, 1f, 0f, ZOOMING_DURATION));
         // TODO(crbug.com/964406): when shrinking to the bottom row, bottom of the tab goes up and
         // down, making the "create group" visible for a while.
         animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab,
                 LayoutTab.MAX_CONTENT_HEIGHT, sourceLayoutTab.getUnclampedOriginalContentHeight(),
                 getWidth(), ZOOMING_DURATION, BakedBezierInterpolator.FADE_OUT_CURVE));

         mTabToSwitcherAnimation = new AnimatorSet();
         mTabToSwitcherAnimation.playTogether(animationList);
         mTabToSwitcherAnimation.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mTabToSwitcherAnimation = null;
                 // Step 2: fade in the real GTS RecyclerView.
                 mGridController.showOverview(true);

                 reportAnimationPerf();
             }
         });
         mStartFrame = mFrameCount;
         mStartTime = SystemClock.elapsedRealtime();
         mLastFrameTime = SystemClock.elapsedRealtime();
         mMaxFrameInterval = 0;
         mTabToSwitcherAnimation.start();
     }

     /**
      * Animate expanding a tab from a source {@link Rect} area.
      * @param source The source {@link Rect} area.
      */
     private void expandTab(Rect source) {
         LayoutTab sourceLayoutTab = createLayoutTab(mTabModelSelector.getCurrentTabId(),
                 mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NEED_TITLE);

         mLayoutTabs = new LayoutTab[] {sourceLayoutTab};

         forceAnimationToFinish();

         CompositorAnimationHandler handler = getAnimationHandler();
         Collection<Animator> animationList = new ArrayList<>(5);

         // Zoom in the source tab
         animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab,
                 LayoutTab.SCALE, source.width() / (getWidth() * mDpToPx), 1, ZOOMING_DURATION));
         animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab, LayoutTab.X,
                 source.left / mDpToPx, 0f, ZOOMING_DURATION));
         animationList.add(CompositorAnimator.ofFloatProperty(
                 handler, sourceLayoutTab, LayoutTab.Y, source.top / mDpToPx, 0f, ZOOMING_DURATION));
         animationList.add(CompositorAnimator.ofFloatProperty(
                 handler, sourceLayoutTab, LayoutTab.DECORATION_ALPHA, 0f, 1f, ZOOMING_DURATION));
         // TODO(crbug.com/964406): when shrinking to the bottom row, bottom of the tab goes up and
         // down, making the "create group" visible for a while.
         animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab,
                 LayoutTab.MAX_CONTENT_HEIGHT, getWidth(),
                 sourceLayoutTab.getUnclampedOriginalContentHeight(), ZOOMING_DURATION,
                 BakedBezierInterpolator.FADE_IN_CURVE));

         mTabToSwitcherAnimation = new AnimatorSet();
         mTabToSwitcherAnimation.playTogether(animationList);
         mTabToSwitcherAnimation.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mTabToSwitcherAnimation = null;
                 mGridTabSwitcher.postHiding();

                 reportAnimationPerf();
             }
         });
         mStartFrame = mFrameCount;
         mStartTime = SystemClock.elapsedRealtime();
         mLastFrameTime = SystemClock.elapsedRealtime();
         mMaxFrameInterval = 0;
         mTabToSwitcherAnimation.start();
     }

     void setPerfListenerForTesting(PerfListener perfListener) {
         mPerfListenerForTesting = perfListener;
     }

     @VisibleForTesting
     GridTabSwitcher getGridTabSwitcherForTesting() {
         return mGridTabSwitcher;
     }

     private void reportAnimationPerf() {
         int frameRendered = mFrameCount - mStartFrame;
         long elapsedMs = SystemClock.elapsedRealtime() - mStartTime;
         long lastDirty = mGridTabSwitcher.getLastDirtyTimeForTesting();
         int dirtySpan = (int) (lastDirty - mStartTime);
         float fps = 1000.f * frameRendered / elapsedMs;
         String message = String.format(Locale.US,
                 "fps = %.2f (%d / %dms), maxFrameInterval = %d, dirtySpan = %d", fps, frameRendered,
                 elapsedMs, mMaxFrameInterval, dirtySpan);

         // TODO(crbug.com/964406): stop reporting on Canary before enabling in Finch.
         if (ChromeVersionInfo.isLocalBuild() || ChromeVersionInfo.isCanaryBuild()) {
             Toast.makeText(ContextUtils.getApplicationContext(), message, Toast.LENGTH_SHORT)
                     .show();
         }

         // TODO(crbug.com/964406): stop logging it after this feature stabilizes.
         if (!ChromeVersionInfo.isStableBuild()) {
             Log.i(TAG, message);
         }

         if (mPerfListenerForTesting != null) {
             mPerfListenerForTesting.onAnimationDone(
                     frameRendered, elapsedMs, mMaxFrameInterval, dirtySpan);
         }
     }

     private boolean getSkipSlowZooming() {
         String skip = ChromeFeatureList.getFieldTrialParamByFeature(
                 ChromeFeatureList.TAB_TO_GTS_ANIMATION, SKIP_SLOW_ZOOMING_PARAM);
         try {
             return Boolean.valueOf(skip);
         } catch (NumberFormatException e) {
             return DEFAULT_SKIP_SLOW_ZOOMING;
         }
     }

     @Override
     protected void updateSceneLayer(RectF viewport, RectF contentViewport,
             LayerTitleCache layerTitleCache, TabContentManager tabContentManager,
             ResourceManager resourceManager, ChromeFullscreenManager fullscreenManager) {
         super.updateSceneLayer(viewport, contentViewport, layerTitleCache, tabContentManager,
                 resourceManager, fullscreenManager);
         assert mSceneLayer != null;
         // The content viewport is intentionally sent as both params below.
         mSceneLayer.pushLayers(getContext(), contentViewport, contentViewport, this,
                 layerTitleCache, tabContentManager, resourceManager, fullscreenManager,
                 ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION)
                         ? mGridTabSwitcher.getResourceId()
                         : 0);
         mFrameCount++;
         if (mLastFrameTime != 0) {
             long elapsed = SystemClock.elapsedRealtime() - mLastFrameTime;
             mMaxFrameInterval = Math.max(mMaxFrameInterval, elapsed);
         }
         mLastFrameTime = SystemClock.elapsedRealtime();
     }
 }
	// Copyright 2019 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.chrome.browser.widget;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.content.Context;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.os.SystemClock;

	import org.chromium.base.ContextUtils;
	import org.chromium.base.Log;
	import org.chromium.base.Supplier;
	import org.chromium.base.VisibleForTesting;
	import org.chromium.chrome.browser.ChromeFeatureList;
	import org.chromium.chrome.browser.ChromeVersionInfo;
	import org.chromium.chrome.browser.compositor.LayerTitleCache;
	import org.chromium.chrome.browser.compositor.animation.CompositorAnimationHandler;
	import org.chromium.chrome.browser.compositor.animation.CompositorAnimator;
	import org.chromium.chrome.browser.compositor.layouts.Layout;
	import org.chromium.chrome.browser.compositor.layouts.LayoutRenderHost;
	import org.chromium.chrome.browser.compositor.layouts.LayoutUpdateHost;
	import org.chromium.chrome.browser.compositor.layouts.components.LayoutTab;
	import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
	import org.chromium.chrome.browser.compositor.layouts.eventfilter.EventFilter;
	import org.chromium.chrome.browser.compositor.scene_layer.SceneLayer;
	import org.chromium.chrome.browser.compositor.scene_layer.TabListSceneLayer;
	import org.chromium.chrome.browser.fullscreen.ChromeFullscreenManager;
	import org.chromium.chrome.browser.tab.Tab;
	import org.chromium.chrome.browser.tasks.tab_management.GridTabSwitcher;
	import org.chromium.ui.interpolators.BakedBezierInterpolator;
	import org.chromium.ui.resources.ResourceManager;
	import org.chromium.ui.widget.Toast;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Locale;

	/**
	* A {@link Layout} that shows all tabs in one grid view.
	*/
	public class GridTabSwitcherLayout
	extends Layout implements GridTabSwitcher.GridVisibilityObserver {
	private static final String TAG = "GTSLayout";

	// Duration of the transition animation
	@VisibleForTesting
	static final long ZOOMING_DURATION = 300;

	/** Field trial parameter for whether skipping slow zooming animation */
	private static final String SKIP_SLOW_ZOOMING_PARAM = "skip-slow-zooming";
	private static final boolean DEFAULT_SKIP_SLOW_ZOOMING = false;

	// The transition animation from a tab to the tab switcher.
	private AnimatorSet mTabToSwitcherAnimation;

	private final TabListSceneLayer mSceneLayer = new TabListSceneLayer();
	private final GridTabSwitcher mGridTabSwitcher;
	private final GridTabSwitcher.GridController mGridController;
	// To force Toolbar finishes its animation when this Layout finished hiding.
	private final LayoutTab mDummyLayoutTab;

	private int mFrameCount;
	private long mStartTime;
	private long mLastFrameTime;
	private long mMaxFrameInterval;
	private int mStartFrame;

	interface PerfListener {
	void onAnimationDone(
	int frameRendered, long elapsedMs, long maxFrameInterval, int dirtySpan);
	}

	private PerfListener mPerfListenerForTesting;

	public GridTabSwitcherLayout(Context context, LayoutUpdateHost updateHost,
	LayoutRenderHost renderHost, GridTabSwitcher gridTabSwitcher) {
	super(context, updateHost, renderHost);
	mDummyLayoutTab = createLayoutTab(Tab.INVALID_TAB_ID, false, false, false);
	mDummyLayoutTab.setShowToolbar(true);
	mGridTabSwitcher = gridTabSwitcher;
	mGridController = gridTabSwitcher.getGridController();
	mGridController.addOverviewModeObserver(this);
	}

	@Override
	public LayoutTab getLayoutTab(int id) {
	return mDummyLayoutTab;
	}

	@Override
	public void destroy() {
	if (mGridController != null) {
	mGridController.removeOverviewModeObserver(this);
	}
	}

	@Override
	public void show(long time, boolean animate) {
	super.show(time, animate);

	boolean showShrinkingAnimation =
	animate && ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION);
	boolean quick = mGridTabSwitcher.prepareOverview();
	if (getSkipSlowZooming()) {
	showShrinkingAnimation &= quick;
	}

	if (!showShrinkingAnimation) {
	// Keep the current tab in mLayoutTabs so that thumbnail taking is not blocked.
	LayoutTab sourceLayoutTab = createLayoutTab(mTabModelSelector.getCurrentTabId(),
	mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NEED_TITLE);
	mLayoutTabs = new LayoutTab[] {sourceLayoutTab};

	mGridController.showOverview(animate);
	return;
	}

	shrinkTab(() -> mGridTabSwitcher.getThumbnailLocationOfCurrentTab(false));
	}

	@Override
	protected void updateLayout(long time, long dt) {
	super.updateLayout(time, dt);
	if (mLayoutTabs == null) return;

	assert mLayoutTabs.length == 1;
	boolean needUpdate = mLayoutTabs[0].updateSnap(dt);
	if (needUpdate) requestUpdate();
	}

	@Override
	public boolean onBackPressed() {
	if (mTabModelSelector.getCurrentModel().getCount() == 0) return false;

	if (mGridController.overviewVisible()) {
	mGridController.hideOverview(true);
	return true;
	}

	return false;
	}

	@Override
	protected EventFilter getEventFilter() {
	return null;
	}

	@Override
	protected SceneLayer getSceneLayer() {
	return mSceneLayer;
	}

	@Override
	public boolean handlesTabClosing() {
	return true;
	}

	@Override
	public boolean handlesTabCreating() {
	return true;
	}

	@Override
	public boolean handlesCloseAll() {
	return false;
	}

	// GridTabSwitcher.GridVisibilityObserver implementation.
	@Override
	public void onOverviewModeStartedShowing(boolean showToolbar) {}

	@Override
	public void onOverviewModeFinishedShowing() {
	doneShowing();
	Tab currentTab = mTabModelSelector.getCurrentTab();
	if (currentTab != null) mTabContentManager.cacheTabThumbnail(currentTab);
	}

	@Override
	public void onOverviewModeStartedHiding(boolean showToolbar, boolean delayAnimation) {
	startHiding(mTabModelSelector.getCurrentTabId(), false);
	if (!ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION)) {
	mGridTabSwitcher.postHiding();
	return;
	}
	expandTab(mGridTabSwitcher.getThumbnailLocationOfCurrentTab(true));
	}

	@Override
	public void onOverviewModeFinishedHiding() {}

	@Override
	protected void forceAnimationToFinish() {
	super.forceAnimationToFinish();
	if (mTabToSwitcherAnimation != null) {
	if (mTabToSwitcherAnimation.isRunning()) mTabToSwitcherAnimation.end();
	}
	}

	/**
	* Animate shrinking a tab to a target {@link Rect} area.
	* @param target The target {@link Rect} area.
	*/
	private void shrinkTab(Supplier<Rect> target) {
	LayoutTab sourceLayoutTab = createLayoutTab(mTabModelSelector.getCurrentTabId(),
	mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NEED_TITLE);

	mLayoutTabs = new LayoutTab[] {sourceLayoutTab};

	forceAnimationToFinish();

	CompositorAnimationHandler handler = getAnimationHandler();
	Collection<Animator> animationList = new ArrayList<>(5);

	// Step 1: zoom out the source tab
	animationList.add(CompositorAnimator.ofFloatProperty(
	handler, sourceLayoutTab, LayoutTab.SCALE, () -> 1f, () -> {
	return target.get().width() / (getWidth() * mDpToPx);
	}, ZOOMING_DURATION));
	animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab, LayoutTab.X,
	() -> 0f, () -> { return target.get().left / mDpToPx; }, ZOOMING_DURATION));
	animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab, LayoutTab.Y,
	() -> 0f, () -> { return target.get().top / mDpToPx; }, ZOOMING_DURATION));
	animationList.add(CompositorAnimator.ofFloatProperty(
	handler, sourceLayoutTab, LayoutTab.DECORATION_ALPHA, 1f, 0f, ZOOMING_DURATION));
	// TODO(crbug.com/964406): when shrinking to the bottom row, bottom of the tab goes up and
	// down, making the "create group" visible for a while.
	animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab,
	LayoutTab.MAX_CONTENT_HEIGHT, sourceLayoutTab.getUnclampedOriginalContentHeight(),
	getWidth(), ZOOMING_DURATION, BakedBezierInterpolator.FADE_OUT_CURVE));

	mTabToSwitcherAnimation = new AnimatorSet();
	mTabToSwitcherAnimation.playTogether(animationList);
	mTabToSwitcherAnimation.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	mTabToSwitcherAnimation = null;
	// Step 2: fade in the real GTS RecyclerView.
	mGridController.showOverview(true);

	reportAnimationPerf();
	}
	});
	mStartFrame = mFrameCount;
	mStartTime = SystemClock.elapsedRealtime();
	mLastFrameTime = SystemClock.elapsedRealtime();
	mMaxFrameInterval = 0;
	mTabToSwitcherAnimation.start();
	}

	/**
	* Animate expanding a tab from a source {@link Rect} area.
	* @param source The source {@link Rect} area.
	*/
	private void expandTab(Rect source) {
	LayoutTab sourceLayoutTab = createLayoutTab(mTabModelSelector.getCurrentTabId(),
	mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NEED_TITLE);

	mLayoutTabs = new LayoutTab[] {sourceLayoutTab};

	forceAnimationToFinish();

	CompositorAnimationHandler handler = getAnimationHandler();
	Collection<Animator> animationList = new ArrayList<>(5);

	// Zoom in the source tab
	animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab,
	LayoutTab.SCALE, source.width() / (getWidth() * mDpToPx), 1, ZOOMING_DURATION));
	animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab, LayoutTab.X,
	source.left / mDpToPx, 0f, ZOOMING_DURATION));
	animationList.add(CompositorAnimator.ofFloatProperty(
	handler, sourceLayoutTab, LayoutTab.Y, source.top / mDpToPx, 0f, ZOOMING_DURATION));
	animationList.add(CompositorAnimator.ofFloatProperty(
	handler, sourceLayoutTab, LayoutTab.DECORATION_ALPHA, 0f, 1f, ZOOMING_DURATION));
	// TODO(crbug.com/964406): when shrinking to the bottom row, bottom of the tab goes up and
	// down, making the "create group" visible for a while.
	animationList.add(CompositorAnimator.ofFloatProperty(handler, sourceLayoutTab,
	LayoutTab.MAX_CONTENT_HEIGHT, getWidth(),
	sourceLayoutTab.getUnclampedOriginalContentHeight(), ZOOMING_DURATION,
	BakedBezierInterpolator.FADE_IN_CURVE));

	mTabToSwitcherAnimation = new AnimatorSet();
	mTabToSwitcherAnimation.playTogether(animationList);
	mTabToSwitcherAnimation.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	mTabToSwitcherAnimation = null;
	mGridTabSwitcher.postHiding();

	reportAnimationPerf();
	}
	});
	mStartFrame = mFrameCount;
	mStartTime = SystemClock.elapsedRealtime();
	mLastFrameTime = SystemClock.elapsedRealtime();
	mMaxFrameInterval = 0;
	mTabToSwitcherAnimation.start();
	}

	void setPerfListenerForTesting(PerfListener perfListener) {
	mPerfListenerForTesting = perfListener;
	}

	@VisibleForTesting
	GridTabSwitcher getGridTabSwitcherForTesting() {
	return mGridTabSwitcher;
	}

	private void reportAnimationPerf() {
	int frameRendered = mFrameCount - mStartFrame;
	long elapsedMs = SystemClock.elapsedRealtime() - mStartTime;
	long lastDirty = mGridTabSwitcher.getLastDirtyTimeForTesting();
	int dirtySpan = (int) (lastDirty - mStartTime);
	float fps = 1000.f * frameRendered / elapsedMs;
	String message = String.format(Locale.US,
	"fps = %.2f (%d / %dms), maxFrameInterval = %d, dirtySpan = %d", fps, frameRendered,
	elapsedMs, mMaxFrameInterval, dirtySpan);

	// TODO(crbug.com/964406): stop reporting on Canary before enabling in Finch.
	if (ChromeVersionInfo.isLocalBuild() \|\| ChromeVersionInfo.isCanaryBuild()) {
	Toast.makeText(ContextUtils.getApplicationContext(), message, Toast.LENGTH_SHORT)
	.show();
	}

	// TODO(crbug.com/964406): stop logging it after this feature stabilizes.
	if (!ChromeVersionInfo.isStableBuild()) {
	Log.i(TAG, message);
	}

	if (mPerfListenerForTesting != null) {
	mPerfListenerForTesting.onAnimationDone(
	frameRendered, elapsedMs, mMaxFrameInterval, dirtySpan);
	}
	}

	private boolean getSkipSlowZooming() {
	String skip = ChromeFeatureList.getFieldTrialParamByFeature(
	ChromeFeatureList.TAB_TO_GTS_ANIMATION, SKIP_SLOW_ZOOMING_PARAM);
	try {
	return Boolean.valueOf(skip);
	} catch (NumberFormatException e) {
	return DEFAULT_SKIP_SLOW_ZOOMING;
	}
	}

	@Override
	protected void updateSceneLayer(RectF viewport, RectF contentViewport,
	LayerTitleCache layerTitleCache, TabContentManager tabContentManager,
	ResourceManager resourceManager, ChromeFullscreenManager fullscreenManager) {
	super.updateSceneLayer(viewport, contentViewport, layerTitleCache, tabContentManager,
	resourceManager, fullscreenManager);
	assert mSceneLayer != null;
	// The content viewport is intentionally sent as both params below.
	mSceneLayer.pushLayers(getContext(), contentViewport, contentViewport, this,
	layerTitleCache, tabContentManager, resourceManager, fullscreenManager,
	ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION)
	? mGridTabSwitcher.getResourceId()
	: 0);
	mFrameCount++;
	if (mLastFrameTime != 0) {
	long elapsed = SystemClock.elapsedRealtime() - mLastFrameTime;
	mMaxFrameInterval = Math.max(mMaxFrameInterval, elapsed);
	}
	mLastFrameTime = SystemClock.elapsedRealtime();
	}
	}