Cast: Add JS API to get raw events logs from cast extension.

chrome/renderer/media/cast_session.h

 // Copyright 2013 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_MEDIA_CAST_SESSION_H_
 #define CHROME_RENDERER_MEDIA_CAST_SESSION_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 39 matching lines @@
   // When Cast sender is started and ready to be used
   // media::cast::FrameInput will be given through the callback. The
   // callback will be made on the main thread.
   void StartAudio(const media::cast::AudioSenderConfig& config,
                   const FrameInputAvailableCallback& callback);
   void StartVideo(const media::cast::VideoSenderConfig& config,
                   const FrameInputAvailableCallback& callback);
   void StartUDP(const net::IPEndPoint& local_endpoint,
                 const net::IPEndPoint& remote_endpoint);
 
-  // Get raw event logs and provide the results in |callback| on main thread.
-  void GetEventLogsAndReset(const EventLogsCallback& callback);
+  // Creates an event subscriber for a stream with |stream_id|. The subscriber
+  // will process audio or video events depending on |is_audio|.
+  void StartLogging(const int stream_id, const bool is_audio);
+
+  // Returns raw event logs in serialized format for |stream_id| since
+  // last call and returns result in |callback|.
+  void GetEventLogsAndReset(const EventLogsCallback& callback,
+                            const int stream_id);
 
  private:
   friend class base::RefCounted<CastSession>;
   virtual ~CastSession();
 
   // This member should never be dereferenced on the main thread.
   // CastSessionDelegate lives only on the IO thread. It is always
   // safe to post task on the IO thread to access CastSessionDelegate
   // because it is owned by this object.
   scoped_ptr<CastSessionDelegate> delegate_;
 
   // Proxy to the IO message loop.
   const scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(CastSession);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CAST_SESSION_H_