[Extensions Toolbar Mac] Allow the overflow toolbar to use the theme provider

chrome/browser/ui/cocoa/extensions/browser_action_button.mm

 // Copyright (c) 2012 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/extensions/browser_action_button.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/extensions/browser_actions_controller.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_action_context_menu_controller.h"
+#import "chrome/browser/ui/cocoa/themed_window.h"
 #import "chrome/browser/ui/cocoa/toolbar/toolbar_action_view_delegate_cocoa.h"
 #include "chrome/browser/ui/toolbar/toolbar_action_view_controller.h"
 #include "grit/theme_resources.h"
 #include "skia/ext/skia_utils_mac.h"
 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMNSAnimation+Duration.h"
 #include "ui/gfx/canvas_skia_paint.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 
@@ skipping 368 matching lines @@
                operation:NSCompositeSourceOver
                 fraction:enabled ? 1.0 : 0.4
           respectFlipped:YES
                    hints:nil];
 
   cellFrame.origin.y += kBrowserActionBadgeOriginYOffset;
   [self drawBadgeWithinFrame:cellFrame
               forWebContents:webContents];
 }
 
+- (ui::ThemeProvider*)themeProviderForWindow:(NSWindow*)window {
+  ui::ThemeProvider* themeProvider = [window themeProvider];
+  if (!themeProvider)
+    themeProvider =
+        [[browserActionsController_ browser]->window()->GetNativeWindow()
+            themeProvider];
+  return themeProvider;
+}
+
 @end