Cast: Plumb raw event logs to cast extension, install EncodingEventSubscriber on CastSessionDelegat…

chrome/renderer/media/cast_session.h

Index: chrome/renderer/media/cast_session.h
diff --git a/chrome/renderer/media/cast_session.h b/chrome/renderer/media/cast_session.h
index 63278b54f25ff901364ccf9b0148c11371e8df2b..720821fb575054017e9a00fbeed13ba8545b3033 100644
--- a/chrome/renderer/media/cast_session.h
+++ b/chrome/renderer/media/cast_session.h
@@ -41,6 +41,7 @@ class CastSession : public base::RefCounted<CastSession> {
   base::Callback<void(const scoped_refptr<media::cast::FrameInput>&)>
   FrameInputAvailableCallback;
   typedef base::Callback<void(const std::vector<char>&)> SendPacketCallback;
+  typedef base::Callback<void(scoped_ptr<std::string>)> EventLogsCallback;
 
   CastSession();
 
@@ -56,6 +57,9 @@ class CastSession : public base::RefCounted<CastSession> {
   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);
+
  private:
   friend class base::RefCounted<CastSession>;
   virtual ~CastSession();