Connect Mojo AudioDecoder service to the Mojo service factory

media/mojo/services/mojo_media_client.cc

Index: media/mojo/services/mojo_media_client.cc
diff --git a/media/mojo/services/mojo_media_client.cc b/media/mojo/services/mojo_media_client.cc
index d0416f97a669f65fbd340b5201169e1e8a5ea4c2..0ca6fe6fb5b1f2539048ac7414b54155909f08c6 100644
--- a/media/mojo/services/mojo_media_client.cc
+++ b/media/mojo/services/mojo_media_client.cc
@@ -12,6 +12,11 @@ MojoMediaClient::~MojoMediaClient() {}
 
 void MojoMediaClient::Initialize() {}
 
+scoped_ptr<AudioDecoder> MojoMediaClient::CreateAudioDecoder(
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
+  return nullptr;
+}
+
 scoped_ptr<RendererFactory> MojoMediaClient::CreateRendererFactory(
     const scoped_refptr<MediaLog>& media_log) {
   return nullptr;