Mac: Fix a recently introduced layering bug.

chrome/browser/ui/cocoa/browser_window_controller.h

 // Copyright (c) 2012 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_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single toolbar and, by virtue of being a
@@ skipping 153 matching lines @@
   // -windowDidEnterFullScreen: gets called.
   GURL fullscreenUrl_;
   FullscreenExitBubbleType fullscreenBubbleType_;
 
   // The Extension Command Registry used to determine which keyboard events to
   // handle.
   scoped_ptr<ExtensionKeybindingRegistryCocoa> extension_keybinding_registry_;
 
   // The number of overlapped views being shown.
   NSUInteger overlappedViewCount_;
+
+  // Whether the root view of the window is layer backed.
+  BOOL windowViewWantsLayer_;
 }
 
 // A convenience class method which gets the |BrowserWindowController| for a
 // given window. This method returns nil if no window in the chain has a BWC.
 + (BrowserWindowController*)browserWindowControllerForWindow:(NSWindow*)window;
 
 // A convenience class method which gets the |BrowserWindowController| for a
 // given view.  This is the controller for the window containing |view|, if it
 // is a BWC, or the first controller in the parent-window chain that is a
 // BWC. This method returns nil if no window in the chain has a BWC.
@@ skipping 352 matching lines @@
 // positioned relative to.
 - (NSRect)omniboxPopupAnchorRect;
 
 // Force a layout of info bars.
 - (void)layoutInfoBars;
 
 @end  // @interface BrowserWindowController (TestingAPI)
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_