Implement basic theming for panel titlebars.

chrome/browser/ui/cocoa/themed_browser_window.mm

Index: chrome/browser/ui/cocoa/themed_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/chrome_browser_window.mm b/chrome/browser/ui/cocoa/themed_browser_window.mm
similarity index 63%
copy from chrome/browser/ui/cocoa/chrome_browser_window.mm
copy to chrome/browser/ui/cocoa/themed_browser_window.mm
index e21507bdfc0cea40d36336736fe93efa54983ec4..363e6e95a7404186877a2e3597f58ef741f278cb 100644
--- a/chrome/browser/ui/cocoa/chrome_browser_window.mm
+++ b/chrome/browser/ui/cocoa/themed_browser_window.mm
@@ -2,31 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#import "chrome/browser/ui/cocoa/chrome_browser_window.h"
+#import "chrome/browser/ui/cocoa/themed_browser_window.h"
 
 #include "base/logging.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "ui/base/theme_provider.h"
 
-@implementation ChromeBrowserWindow
-
-- (void)underlaySurfaceAdded {
-  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];
-}
+@implementation ThemedBrowserWindow 
 
 - (ui::ThemeProvider*)themeProvider {
   id delegate = [self delegate];