Handle EnableBitstreamConverter RPC message

This is required for proprietory codec when streaming URL type
content.

Review-Url: https://codereview.chromium.org/2568003003
Cr-Commit-Position: refs/heads/master@{#438004}

media/remoting/remote_demuxer_stream_adapter.cc

@@ -116,6 +116,9 @@ void RemoteDemuxerStreamAdapter::OnReceivedRpc(
     case remoting::pb::RpcMessage::RPC_DS_INITIALIZE:
       Initialize(message->integer_value());
       break;
+    case remoting::pb::RpcMessage::RPC_DS_ENABLEBITSTREAMCONVERTER:
+      EnableBitstreamConverter();
+      break;
     case remoting::pb::RpcMessage::RPC_DS_READUNTIL:
       ReadUntil(std::move(message));
       break;
@@ -175,6 +178,11 @@ void RemoteDemuxerStreamAdapter::Initialize(int remote_callback_handle) {
                             rpc_broker_, base::Passed(&rpc)));
 }
 
+void RemoteDemuxerStreamAdapter::EnableBitstreamConverter() {
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+  demuxer_stream_->EnableBitstreamConverter();
+}
+
 void RemoteDemuxerStreamAdapter::ReadUntil(
     std::unique_ptr<remoting::pb::RpcMessage> message) {
   DCHECK(media_task_runner_->BelongsToCurrentThread());

media/remoting/remote_demuxer_stream_adapter.h

@@ -74,6 +74,7 @@ class RemoteDemuxerStreamAdapter {
 
   // RPC message tasks.
   void Initialize(int remote_callback_handle);
+  void EnableBitstreamConverter();
   void ReadUntil(std::unique_ptr<remoting::pb::RpcMessage> message);
   void RequestBuffer(int callback_handle);
   void SendReadAck(int callback_handle);