Cast: Add missing enum and PacketEvent field to cast_messages.

media/cast/logging/logging_defines.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 MEDIA_CAST_LOGGING_LOGGING_DEFINES_H_
 #define MEDIA_CAST_LOGGING_LOGGING_DEFINES_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 22 matching lines @@
   PACKET_SENT_TO_NETWORK,
   PACKET_RETRANSMITTED,
   // Receiver side packet events.
   PACKET_RECEIVED,
   kNumOfLoggingEvents = PACKET_RECEIVED
 };
 
 const char* CastLoggingToString(CastLoggingEvent event);
 
 // CastLoggingEvent are classified into one of three following types.
-enum EventMediaType { AUDIO_EVENT, VIDEO_EVENT, UNKNOWN_EVENT };
+enum EventMediaType {
+  AUDIO_EVENT,
+  VIDEO_EVENT,
+  UNKNOWN_EVENT,
+  EVENT_MEDIA_TYPE_LAST = UNKNOWN_EVENT
+};
 
 struct FrameEvent {
   FrameEvent();
   ~FrameEvent();
 
   RtpTimestamp rtp_timestamp;
   uint32 frame_id;
 
   // Size of encoded frame. Only set for FRAME_ENCODED event.
   size_t size;
@@ skipping 29 matching lines @@
   // Time of event logged.
   base::TimeTicks timestamp;
   CastLoggingEvent type;
   EventMediaType media_type;
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_LOGGING_LOGGING_DEFINES_H_