Fixes bug in instant that resulted in flickery fade. The problem would

chrome/browser/ui/views/frame/contents_container.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
 #pragma once
 
 #include "app/animation_delegate.h"
 #include "base/scoped_ptr.h"
@@ skipping 27 matching lines @@
   // Sets the active top margin.
   void SetActiveTopMargin(int margin);
 
   // Returns the bounds of the preview. If the preview isn't active this
   // retuns the bounds the preview would be shown at.
   gfx::Rect GetPreviewBounds();
 
   // Fades out the active contents.
   void FadeActiveContents();
 
+  // Shows the fade. This is similiar to |FadeActiveContents|, but is immediate.
+  void ShowFade();
+
   // Removes the fade. This is done implicitly when the preview is made active.
   void RemoveFade();
 
   // View overrides:
   virtual void Layout();
 
   // AnimationDelegate overrides:
   virtual void AnimationProgressed(const Animation* animation);
 
  private:
+  class OverlayContentView;
+
+  // Creates the overlay widget. The opacity is set at |initial_opacity|.
+  void CreateOverlay(int initial_opacity);
+
+  // Invoked when the contents view of the overlay is destroyed.
+  void OverlayViewDestroyed();
+
   views::View* active_;
 
   views::View* preview_;
 
   TabContents* preview_tab_contents_;
 
   // Translucent Widget positioned right above the active view that is used to
   // make the active view appear faded out.
   views::Widget* active_overlay_;
 
+  // Content view of active_overlay. Used to track when the widget is destroyed.
+  OverlayContentView* overlay_view_;
+
   // Animation used to vary the opacity of active_overlay.
   scoped_ptr<SlideAnimation> overlay_animation_;
 
   // The margin between the top and the active view. This is used to make the
   // preview overlap the bookmark bar on the new tab page.
   int active_top_margin_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentsContainer);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_