Fix accelerated plugins rendering in Panels on Mac.

chrome/browser/ui/cocoa/chrome_browser_window.mm

Index: chrome/browser/ui/cocoa/chrome_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/chrome_browser_window.mm b/chrome/browser/ui/cocoa/chrome_browser_window.mm
index a6ef49cfa83623cec43d5a9d1c1836b28093ba97..e21507bdfc0cea40d36336736fe93efa54983ec4 100644
--- a/chrome/browser/ui/cocoa/chrome_browser_window.mm
+++ b/chrome/browser/ui/cocoa/chrome_browser_window.mm
@@ -5,6 +5,8 @@
 #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
 
@@ -26,4 +28,25 @@
     [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