move favicon download code from chrome/ into content/

chrome/renderer/favicon_helper.h

-// Copyright (c) 2011 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_RENDERER_FAVICON_HELPER_H_
-#define CHROME_RENDERER_FAVICON_HELPER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/memory/linked_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "content/public/renderer/render_view_observer.h"
-#include "googleurl/src/gurl.h"
-
-struct FaviconURL;
-class SkBitmap;
-
-namespace webkit_glue {
-class MultiResolutionImageResourceFetcher;
-}
-
-// This class deals with favicon downloading.
-// There is one FaviconHelper per RenderView, which is owned by the RenderView.
-class FaviconHelper : public content::RenderViewObserver {
- public:
-  explicit FaviconHelper(content::RenderView* render_view);
-
- private:
-  virtual ~FaviconHelper();
-
-  // Message handler.
-  void OnDownloadFavicon(int id, const GURL& image_url, int image_size);
-
-  // Requests to download a favicon image. When done, the RenderView
-  // is notified by way of DidDownloadFavicon. Returns true if the
-  // request was successfully started, false otherwise. id is used to
-  // uniquely identify the request and passed back to the
-  // DidDownloadFavicon method. If the image has multiple frames, the
-  // frame whose size is image_size is returned. If the image doesn't
-  // have a frame at the specified size, the first is returned.
-  bool DownloadFavicon(int id, const GURL& image_url, int image_size);
-
-  // This callback is triggered when DownloadFavicon completes, either
-  // succesfully or with a failure. See DownloadFavicon for more
-  // details.
-  void DidDownloadFavicon(
-      int requested_size,
-      webkit_glue::MultiResolutionImageResourceFetcher* fetcher,
-      const std::vector<SkBitmap>& images);
-
-  // Decodes a data: URL image or returns an empty image in case of failure.
-  SkBitmap ImageFromDataUrl(const GURL&) const;
-
-  // Send a message to update the favicon URL for a page.
-  void SendUpdateFaviconURL(int32 routing_id,
-                            int32 page_id,
-                            const std::vector<FaviconURL>& urls);
-
-  // RenderViewObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-  virtual void DidStopLoading() OVERRIDE;
-  virtual void DidChangeIcon(WebKit::WebFrame* frame,
-                             WebKit::WebIconURL::Type icon_type) OVERRIDE;
-
-  typedef ScopedVector<webkit_glue::MultiResolutionImageResourceFetcher>
-    ImageResourceFetcherList;
-
-  // ImageResourceFetchers schedule via DownloadImage.
-  ImageResourceFetcherList image_fetchers_;
-
-  DISALLOW_COPY_AND_ASSIGN(FaviconHelper);
-};
-
-#endif  // CHROME_RENDERER_FAVICON_HELPER_H_