move favicon download code from chrome/ into content/

content/public/browser/web_contents.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_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/process_util.h"
@@ skipping 375 matching lines @@
   // Returns true if the location bar should be focused by default rather than
   // the page contents. The view calls this function when the tab is focused
   // to see what it should do.
   virtual bool FocusLocationBarByDefault() = 0;
 
   // Focuses the location bar.
   virtual void SetFocusToLocationBar(bool select_all) = 0;
 
   // Does this have an opener associated with it?
   virtual bool HasOpener() const = 0;
+
+  typedef base::Callback<void(int, /* id */
+                              const GURL&, /* image_url */
+                              bool, /* errored */
+                              int,  /* requested_size */
+                              const std::vector<SkBitmap>& /* bitmaps*/)>
+      FaviconDownloadCallback;
+
+  // Sends a request to download the given favicon |url| and returns the unique
+  // id of the download request. When the download is finished, |callback| will
+  // be called with the bitmaps received from the renderer. Note that
+  // |image_size| is a hint for images with multiple sizes. The downloaded image
+  // is not resized to the given image_size. If 0 is passed, the first frame of
+  // the image is returned.
+  virtual int DownloadFavicon(const GURL& url, int image_size,
+                              const FaviconDownloadCallback& callback) = 0;
+
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_