Add VP9 decode support to the remoting client.

remoting/host/plugin/host_script_object.cc

Index: remoting/host/plugin/host_script_object.cc
diff --git a/remoting/host/plugin/host_script_object.cc b/remoting/host/plugin/host_script_object.cc
index ddcb1cb651737be73572c893bc827a19f28e1e34..3459bf8b518b44b7152490a305ed5fc2b2024fcb 100644
--- a/remoting/host/plugin/host_script_object.cc
+++ b/remoting/host/plugin/host_script_object.cc
@@ -380,6 +380,11 @@ void HostNPScriptObject::It2MeImpl::FinishConnect() {
   scoped_ptr<protocol::CandidateSessionConfig> protocol_config =
       protocol::CandidateSessionConfig::CreateDefault();
   protocol::CandidateSessionConfig::DisableAudioChannel(protocol_config.get());
+
+  // VP9 encode is not yet supported.
+  protocol::CandidateSessionConfig::DisableVideoCodec(
+      protocol_config.get(), protocol::ChannelConfig::CODEC_VP9);
+
   host_->set_protocol_config(protocol_config.Pass());
 
   // Create event logger.