Mac: Well-behaved accelerated plugins, actual fix

chrome/browser/cocoa/chrome_browser_window.h

 // Copyright (c) 2009 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_COCOA_CHROME_BROWSER_WINDOW_H_
 #define CHROME_BROWSER_COCOA_CHROME_BROWSER_WINDOW_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
@@ skipping 20 matching lines @@
 // unhandled keyboard events and subclassing NSWindow is the only method to do
 // this. We also handle our own window controls and custom window frame drawing.
 @interface ChromeBrowserWindow : ChromeEventProcessingWindow {
  @private
   BOOL shouldHideTitle_;
   NSButton* closeButton_;
   NSButton* miniaturizeButton_;
   NSButton* zoomButton_;
   BOOL entered_;
   scoped_nsobject<NSTrackingArea> widgetTrackingArea_;
+  int underlaySurfaceCount_;
 }
 
 // Tells the window to suppress title drawing.
 - (void)setShouldHideTitle:(BOOL)flag;
 
 // Return true if the mouse is currently in our tracking area for our window
 // widgets.
 - (BOOL)mouseInGroup:(NSButton*)widget;
 
 // Update the tracking areas for our window widgets as appropriate.
 - (void)updateTrackingAreas;
 
+// Informs the window that an underlay surface has been added/removed. The
+// window is non-opaque while underlay surfaces are present.
+- (void)underlaySurfaceAdded;
+- (void)underlaySurfaceRemoved;
+
 @end
 
 @interface NSWindow (UndocumentedAPI)
 
 // Undocumented Cocoa API to suppress drawing of the window's title.
 // -setTitle: still works, but the title set only applies to the
 // miniwindow and menus (and, importantly, Expose).  Overridden to
 // return |shouldHideTitle_|.
 -(BOOL)_isTitleHidden;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_CHROME_BROWSER_WINDOW_H_