Enabled logging for WebUIs working in off-the-record context.

BUG=453779
TEST=manually

Review URL: https://codereview.chromium.org/893573002

Cr-Commit-Position: refs/heads/master@{#315806}
(cherry picked from commit 6b3e53c4f03afc8f999c17aaa139523c098a4775)

Review URL: https://codereview.chromium.org/925933002

Cr-Commit-Position: refs/branch-heads/2272@{#288}
Cr-Branched-From: 827a380cfdb31aa54c8d56e63ce2c3fd8c3ba4d4-refs/heads/master@{#310958}

diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 00fed25..3edcf7c 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc

@@ -551,14 +551,20 @@
     return;
 
   // Pass through log level only on WebUI pages to limit console spew.
-  int32 resolved_level =
-      HasWebUIScheme(delegate_->GetMainFrameLastCommittedURL()) ? level : 0;
+  const bool is_web_ui =
+      HasWebUIScheme(delegate_->GetMainFrameLastCommittedURL());
+  const int32 resolved_level = is_web_ui ? level : ::logging::LOG_INFO;
 
   // LogMessages can be persisted so this shouldn't be logged in incognito mode.
-  if (resolved_level >= ::logging::GetMinLogLevel()
-      && !GetSiteInstance()->GetBrowserContext()->IsOffTheRecord()) {
-    logging::LogMessage("CONSOLE", line_no, resolved_level).stream() << "\"" <<
-        message << "\", source: " << source_id << " (" << line_no << ")";
+  // This rule is not applied to WebUI pages, because source code of WebUI is a
+  // part of Chrome source code, and we want to treat messages from WebUI the
+  // same way as we treat log messages from native code.
+  if (::logging::GetMinLogLevel() <= resolved_level &&
+      (is_web_ui ||
+       !GetSiteInstance()->GetBrowserContext()->IsOffTheRecord())) {
+    logging::LogMessage("CONSOLE", line_no, resolved_level).stream()
+        << "\"" << message << "\", source: " << source_id << " (" << line_no
+        << ")";
   }
 }