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

media/cast/logging/log_serializer.h

 // Copyright 2014 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 MEDIA_CAST_LOGGING_LOG_SERIALIZER_H_
 #define MEDIA_CAST_LOGGING_LOG_SERIALIZER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 18 matching lines @@
 // 3. Call |GetSerializedLogAndReset()| to get the result.
 // 4. (Optional) Call |GetSerializedLengthSoFar()| between each serialize call.
 class LogSerializer {
  public:
   // Constructs a LogSerializer that caps size of serialized message to
   // |max_serialized_bytes|.
   LogSerializer(const int max_serialized_bytes);
   ~LogSerializer();
 
   // Serialize |frame_events|, |packet_events|, |first_rtp_timestamp|
-  // returned from EncodingEventSubscriber associated with |stream_id|.
+  // returned from EncodingEventSubscriber. |is_audio| indicates whether the
+  // events are from an audio or video stream.
   //
   // Returns |true| if serialization is successful. This function
   // returns |false| if the serialized string will exceed |kMaxSerializedsize|.
   //
   // This may be called multiple times with different streams and events before
   // calling |GetSerializedString()|.
   //
   // See .cc file for format specification.
-  bool SerializeEventsForStream(const int stream_id,
+  bool SerializeEventsForStream(bool is_audio,
                                 const FrameEventMap& frame_events,
                                 const PacketEventMap& packet_events,
                                 const RtpTimestamp first_rtp_timestamp);
 
   // Gets a string of serialized events up to the last successful call to
   // |SerializeEventsForStream()| and resets it.
   scoped_ptr<std::string> GetSerializedLogAndReset();
 
   // Returns the length of the serialized string since last
   // successful serialization / reset.
   int GetSerializedLength() const;
 
  private:
   scoped_ptr<std::string> serialized_log_so_far_;
   int index_so_far_;
   const int max_serialized_bytes_;
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_LOGGING_LOG_SERIALIZER_H_