[Android] Fix a flicker in stopping Chrome

content/shell/android/java/src/org/chromium/content_shell/ShellManager.java

Index: content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
diff --git a/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java b/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
index 1dfc60a632494ad504ec9d34e4f5f0987841f1ea..bd22caaed8aca6b1be11185c06da8bbb85532107 100644
--- a/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
+++ b/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
@@ -78,6 +78,13 @@ public class ShellManager extends FrameLayout {
                     sStartup = false;
                 }
             }
+
+            @Override
+            protected void onWindowHidden() {

[David Trainor- moved to gerrit, 2015/01/15 01:16:07]

We should just use the other method IMO.  Lets keep the visible API boundary as
small as possible since we want to eventually roll all these cases into a better
place (maybe Tab#getView()?).

[Changwan Ryu, 2015/01/15 01:51:34]

Done.

+                if (mActiveShell == null) return;
+                ContentViewCore contentViewCore = mActiveShell.getContentViewCore();
+                if (contentViewCore != null) contentViewCore.onHide();
+            }
         };
         mContentViewRenderView.onNativeLibraryLoaded(window);
     }