[Material][Mac] Replace the default favicon with a vector

chrome/browser/ui/cocoa/tab_contents/favicon_util_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 CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_FAVICON_UTIL_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_FAVICON_UTIL_MAC_H_
 
+#include "third_party/skia/include/core/SkColor.h"
+
 @class NSImage;
 
 namespace content {
 class WebContents;
 }
 
 namespace mac {
 
 // Returns an autoreleased favicon for a given WebContents. If |contents|
 // is NULL or there's no favicon for the NavigationEntry, this will return the
-// default image.
-NSImage* FaviconForWebContents(content::WebContents* contents);
+// default image. The color parameter is only used for the default vector image
+// in Material design.
+NSImage* FaviconForWebContents(content::WebContents* contents,
+                               SkColor color = SK_ColorBLACK);
 
 }  // namespace mac
 
 #endif  // CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_FAVICON_UTIL_MAC_H_