Chromecast: communicate HDMI-sink codec changes over IPC.

chromecast/common/media/cast_messages.h

Index: chromecast/common/media/cast_messages.h
diff --git a/chromecast/common/media/cast_messages.h b/chromecast/common/media/cast_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..3d9cc2a88c42c9d02a7ca7d7b854b9706a2ee096
--- /dev/null
+++ b/chromecast/common/media/cast_messages.h
@@ -0,0 +1,17 @@
+// Copyright 2015 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.
+
+// IPC messages related to media on Chromecast.
+// Multiply-included message file, hence no include guard.
+
+#include "ipc/ipc_message_macros.h"
+
+#undef IPC_MESSAGE_EXPORT
+#define IPC_MESSAGE_EXPORT
+#define IPC_MESSAGE_START CastMediaMsgStart
+
+// Messages sent from the browser to the renderer process.
+
+IPC_MESSAGE_CONTROL1(CmaMsg_UpdateSupportedHdmiSinkCodecs,
+                     int /* Codec support, bitmask of media_caps.h values */)