[WIP] Proxy RtcVideoDecoder calls to a media::VideoDecoder.

chromecast/browser/cast_content_browser_client.cc

Index: chromecast/browser/cast_content_browser_client.cc
diff --git a/chromecast/browser/cast_content_browser_client.cc b/chromecast/browser/cast_content_browser_client.cc
index 0c601c31f543cf276084da536929169a3dacbd67..63d9e931edc9e6c59b7b75899e0c508f174cee29 100644
--- a/chromecast/browser/cast_content_browser_client.cc
+++ b/chromecast/browser/cast_content_browser_client.cc
@@ -77,28 +77,39 @@ namespace shell {
 
 namespace {
 #if defined(ENABLE_MOJO_MEDIA_IN_BROWSER_PROCESS)
+
+static std::unique_ptr<media::CastMojoMediaClient> CreateCastMojoMediaClient(
+    CastContentBrowserClient* browser_client) {
+  return base::MakeUnique<media::CastMojoMediaClient>(
+      base::Bind(&CastContentBrowserClient::CreateMediaPipelineBackend,
+                 base::Unretained(browser_client)),
+      base::Bind(&CastContentBrowserClient::CreateCdmFactory,
+                 base::Unretained(browser_client)),
+      browser_client->GetVideoResolutionPolicy(),
+      browser_client->media_resource_tracker());
+}
+
 static std::unique_ptr<::shell::Service> CreateMojoMediaApplication(
     CastContentBrowserClient* browser_client,
     const base::Closure& quit_closure) {
-  std::unique_ptr<media::CastMojoMediaClient> mojo_media_client(
-      new media::CastMojoMediaClient(
-          base::Bind(&CastContentBrowserClient::CreateMediaPipelineBackend,
-                     base::Unretained(browser_client)),
-          base::Bind(&CastContentBrowserClient::CreateCdmFactory,
-                     base::Unretained(browser_client)),
-          browser_client->GetVideoResolutionPolicy(),
-          browser_client->media_resource_tracker()));
-  return std::unique_ptr<::shell::Service>(
-      new ::media::MojoMediaApplication(std::move(mojo_media_client),
-                                        quit_closure));
+  return std::unique_ptr<::shell::Service>(new ::media::MojoMediaApplication(
+      CreateCastMojoMediaClient(browser_client), quit_closure));
 }
-#endif  // defined(ENABLE_MOJO_MEDIA_IN_BROWSER_PROCESS)
 
+static void CreateVideoDecoder(::media::MojoMediaClient* mojo_media_client,
+                               ::media::mojom::VideoDecoderRequest request) {
+  DCHECK(mojo_media_client);
+  mojo::MakeStrongBinding<::media::mojom::VideoDecoder>(
+      base::MakeUnique<::media::MojoVideoDecoderService>(mojo_media_client),
+      std::move(request));
+}
+#endif  // defined(ENABLE_MOJO_MEDIA_IN_BROWSER_PROCESS)
 }  // namespace
 
 CastContentBrowserClient::CastContentBrowserClient()
     : cast_browser_main_parts_(nullptr),
-      url_request_context_factory_(new URLRequestContextFactory()) {}
+      url_request_context_factory_(new URLRequestContextFactory()),
+      cast_mojo_media_client_(CreateCastMojoMediaClient(this)) {}
 
 CastContentBrowserClient::~CastContentBrowserClient() {
   content::BrowserThread::DeleteSoon(
@@ -422,6 +433,7 @@ void CastContentBrowserClient::ExposeInterfacesToRenderer(
       base::Bind(&media::MediaCapsImpl::AddBinding,
                  base::Unretained(cast_browser_main_parts_->media_caps())),
       base::ThreadTaskRunnerHandle::Get());
+  registry->AddInterface()
 }
 
 void CastContentBrowserClient::RegisterInProcessMojoApplications(