Fix accelerated plugins rendering in Panels on Mac.

chrome/browser/ui/cocoa/chrome_browser_window.mm

 // Copyright (c) 2011 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/ui/cocoa/chrome_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];
 }
 
+- (ui::ThemeProvider*)themeProvider {
+  id delegate = [self delegate];
+  if (![delegate respondsToSelector:@selector(themeProvider)])
+    return NULL;
+  return [delegate themeProvider];
+}
+
+- (ThemedWindowStyle)themedWindowStyle {
+  id delegate = [self delegate];
+  if (![delegate respondsToSelector:@selector(themedWindowStyle)])
+    return THEMED_NORMAL;
+  return [delegate themedWindowStyle];
+}
+
+- (NSPoint)themePatternPhase {
+  id delegate = [self delegate];
+  if (![delegate respondsToSelector:@selector(themePatternPhase)])
+    return NSMakePoint(0, 0);
+  return [delegate themePatternPhase];
+}
+
 @end