Mac: Support compositor in fullscreen windows.

chrome/browser/cocoa/fullscreen_window.mm

 // 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.
 
 #import "chrome/browser/cocoa/fullscreen_window.h"
 
 #include "base/mac_util.h"
 #import "chrome/browser/cocoa/themed_window.h"
 #include "chrome/browser/themes/browser_theme_provider.h"
 
@@ skipping 85 matching lines @@
   return [delegate themedWindowStyle];
 }
 
 - (NSPoint)themePatternPhase {
   id delegate = [self delegate];
   if (![delegate respondsToSelector:@selector(themePatternPhase)])
     return NSMakePoint(0, 0);
   return [delegate themePatternPhase];
 }
 
+- (void)underlaySurfaceAdded {

[viettrungluu, 2010/08/26 03:12:53]

That's some pretty bad cutting-and-pasting going on there. Maybe we should
rename ChromeEventProcessingWindow, or add something else into (the middle of)
the class hierarchy, where things like this can go?

+  DCHECK_GE(underlaySurfaceCount_, 0);
+  ++underlaySurfaceCount_;
+
+  // We're having the OpenGL surface render under the window, so the window
+  // needs to be not opaque.
+  if (underlaySurfaceCount_ == 1)
+    [self setOpaque:NO];
+}
+
+- (void)underlaySurfaceRemoved {
+  --underlaySurfaceCount_;
+  DCHECK_GE(underlaySurfaceCount_, 0);
+
+  if (underlaySurfaceCount_ == 0)
+    [self setOpaque:YES];
+}
+
 @end