Replace Pipeline::SetNetworkActivity() with BufferedDataSource -> WebMediaPlayerImpl callback.

webkit/media/buffered_data_source.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 WEBKIT_MEDIA_BUFFERED_DATA_SOURCE_H_
 #define WEBKIT_MEDIA_BUFFERED_DATA_SOURCE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 13 matching lines @@
 
 namespace webkit_media {
 
 // A data source capable of loading URLs and buffering the data using an
 // in-memory sliding window.
 //
 // BufferedDataSource must be created and initialized on the render thread
 // before being passed to other threads. It may be deleted on any thread.
 class BufferedDataSource : public media::DataSource {
  public:
+  typedef base::Callback<void(bool)> DownloadingCB;
+
+  // |downloading_cb| will be called whenever the downloading/paused state of
+  // the source changes.
   BufferedDataSource(MessageLoop* render_loop,
                      WebKit::WebFrame* frame,
-                     media::MediaLog* media_log);
+                     media::MediaLog* media_log,
+                     const DownloadingCB& downloading_cb);
 
   // Initialize this object using |url| and |cors_mode|, and call |status_cb|
   // when initialization has completed.
   //
   // Method called on the render thread.
   void Initialize(
       const GURL& url,
       BufferedResourceLoader::CORSMode cors_mode,
       const media::PipelineStatusCB& status_cb);
 
@@ skipping 170 matching lines @@
   int cache_miss_retries_left_;
 
   // Bitrate of the content, 0 if unknown.
   int bitrate_;
 
   // Current playback rate.
   float playback_rate_;
 
   scoped_refptr<media::MediaLog> media_log_;
 
+  DownloadingCB downloading_cb_;
+
   DISALLOW_COPY_AND_ASSIGN(BufferedDataSource);
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_BUFFERED_DATA_SOURCE_H_