[Cast] Repurpose CastInitializationStatus for variable frame size support.

media/cast/cast_config.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_CAST_CONFIG_H_
 #define MEDIA_CAST_CAST_CONFIG_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 158 matching lines @@
   // strings, crypto is not being used.
   std::string aes_key;
   std::string aes_iv_mask;
 };
 
 // Import from media::cast.
 
 typedef Packet Packet;
 typedef PacketList PacketList;
 
-typedef base::Callback<void(CastInitializationStatus)>
-    CastInitializationCallback;
+// Callback that is run to update the client with current status.  This is used
+// to allow the client to wait for asynchronous initialization to complete
+// before sending frames, and also to be notified of any runtime errors that
+// have halted the session.
+typedef base::Callback<void(OperationalStatus)> StatusChangeCallback;
 
 typedef base::Callback<void(scoped_refptr<base::SingleThreadTaskRunner>,
                             scoped_ptr<media::VideoEncodeAccelerator>)>
     ReceiveVideoEncodeAcceleratorCallback;
 typedef base::Callback<void(const ReceiveVideoEncodeAcceleratorCallback&)>
     CreateVideoEncodeAcceleratorCallback;
 
 typedef base::Callback<void(scoped_ptr<base::SharedMemory>)>
     ReceiveVideoEncodeMemoryCallback;
 typedef base::Callback<void(size_t size,
                             const ReceiveVideoEncodeMemoryCallback&)>
     CreateVideoEncodeMemoryCallback;
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_CAST_CONFIG_H_