Makes the current page dim out when transitioning to instant preview.

chrome/browser/ui/views/frame/browser_view.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_BROWSER_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_VIEW_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 301 matching lines @@
                             bool show_history);
   virtual void ShowAppMenu();
   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                       bool* is_keyboard_shortcut);
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
   virtual void ShowCreateShortcutsDialog(TabContents* tab_contents);
   virtual void Cut();
   virtual void Copy();
   virtual void Paste();
   virtual void ToggleTabStripMode();
+  virtual void PrepareForInstant();
   virtual void ShowInstant(TabContents* preview_contents);
   virtual void HideInstant();
   virtual gfx::Rect GetInstantBounds();
 
   // Overridden from BrowserWindowTesting:
   virtual BookmarkBarView* GetBookmarkBarView() const;
   virtual LocationBarView* GetLocationBarView() const;
   virtual views::View* GetTabContentsContainerView() const;
   virtual views::View* GetSidebarContainerView() const;
   virtual ToolbarView* GetToolbarView() const;
@@ skipping 313 matching lines @@
   UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
 
   scoped_ptr<AccessibleViewHelper> accessible_view_helper_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_VIEW_H_