move favicon download code from chrome/ into content/

chrome/browser/favicon/favicon_download_helper.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_FAVICON_FAVICON_DOWNLOAD_HELPER_H_
-#define CHROME_BROWSER_FAVICON_FAVICON_DOWNLOAD_HELPER_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "chrome/common/favicon_url.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace content {
-class WebContents;
-}
-
-namespace gfx {
-class Image;
-}
-
-class GURL;
-class FaviconDownloadHelperDelegate;
-class SkBitmap;
-
-// FaviconDownloadHelper handles requests to download favicons, and listens for
-// the IPC messages from the renderer.
-class FaviconDownloadHelper : public content::WebContentsObserver {
- public:
-  FaviconDownloadHelper(content::WebContents* web_contents,
-                        FaviconDownloadHelperDelegate* delegate);
-
-  virtual ~FaviconDownloadHelper();
-
-  // Starts the download of the given favicon |url| and returns the unique id of
-  // the download request. When the download is finished, an
-  // IconHostMsg_DidDownloadFavicon IPC message will be sent and passed on to
-  // the delegate via FaviconDownloadHelperDelegate::OnDidDownloadFavicon().
-  // 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.
-  int DownloadFavicon(const GURL& url, int image_size);
-
- protected:
-  // content::WebContentsObserver overrides.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
- private:
-  typedef std::set<int> DownloadIdList;
-
-  // Message handler for IconHostMsg_DidDownloadFavicon. Called when the icon
-  // at |image_url| has been downloaded.
-  // |bitmaps| is a list of all the frames of the icon at |image_url|.
-  void OnDidDownloadFavicon(int id,
-                            const GURL& image_url,
-                            bool errored,
-                            int requested_size,
-                            const std::vector<SkBitmap>& bitmaps);
-
-  // Message Handler, called when the FaviconURL associated with the specified
-  // page is updated.
-  void OnUpdateFaviconURL(int32 page_id,
-                          const std::vector<FaviconURL>& candidates);
-
-  // Delegate to pass Favicon bitmaps back to. Weak.
-  FaviconDownloadHelperDelegate* delegate_;
-
-  // Ids of pending downloads.
-  DownloadIdList download_ids_;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(FaviconDownloadHelper);
-};
-
-#endif  // CHROME_BROWSER_FAVICON_FAVICON_DOWNLOAD_HELPER_H_