[Mac] Allow vibrancy & transparency on WebContentsView

content/browser/web_contents/web_contents_view_mac.h

 // 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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
@@ skipping 27 matching lines @@
 CONTENT_EXPORT
 @interface WebContentsViewCocoa : BaseView {
  @private
   content::WebContentsViewMac* webContentsView_;  // WEAK; owns us
   base::scoped_nsobject<WebDragSource> dragSource_;
   base::scoped_nsobject<WebDragDest> dragDest_;
   BOOL mouseDownCanMoveWindow_;
 }
 
 - (void)setMouseDownCanMoveWindow:(BOOL)canMove;
+- (void)setOpaque:(BOOL)opaque;
 
 // Expose this, since sometimes one needs both the NSView and the
 // WebContentsImpl.
 - (content::WebContentsImpl*)webContents;
 @end
 
 namespace content {
 
 // Mac-specific implementation of the WebContentsView. It owns an NSView that
 // contains all of the contents of the tab and associated child views.
@@ skipping 86 matching lines @@
   bool allow_other_views_;
 
   scoped_ptr<PopupMenuHelper> popup_menu_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_