Media Remoting: Add feature to control enabling Media Remoting.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index de2f118f34e72e2b833dba31aedd6962c6651302..3be4d3b72a38e3e0ad5b62da9fa20b454b5ebe17 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2773,13 +2773,13 @@ blink::WebMediaPlayer* RenderFrameImpl::createMediaPlayer(
     media_surface_manager_ = new RendererSurfaceViewManager(this);
 #endif  // defined(OS_ANDROID)
 
+  base::WeakPtr<media::MediaObserver> media_observer;
 #if BUILDFLAG(ENABLE_MEDIA_REMOTING)
-  std::unique_ptr<media::RemotingController> remoting_controller =
-      CreateRemotingController();
-  base::WeakPtr<media::MediaObserver> media_observer =
-      remoting_controller->GetWeakPtr();
-#else
-  base::WeakPtr<media::MediaObserver> media_observer = nullptr;
+  std::unique_ptr<media::RemotingController> remoting_controller;
+  if (base::FeatureList::IsEnabled(media::kMediaRemoting)) {
+    remoting_controller = CreateRemotingController();
+    media_observer = remoting_controller->GetWeakPtr();
+  }
 #endif
 
   media::WebMediaPlayerParams params(
@@ -2835,8 +2835,10 @@ blink::WebMediaPlayer* RenderFrameImpl::createMediaPlayer(
 #if BUILDFLAG(ENABLE_MEDIA_REMOTING)
   media::RemotingController* remoting_controller_ptr =
       remoting_controller.get();
-  media_renderer_factory = base::MakeUnique<media::RemotingRendererFactory>(
-      std::move(media_renderer_factory), std::move(remoting_controller));
+  if (remoting_controller) {
+    media_renderer_factory = base::MakeUnique<media::RemotingRendererFactory>(
+        std::move(media_renderer_factory), std::move(remoting_controller));
+  }
 #endif
 
   if (!url_index_.get() || url_index_->frame() != frame_)
@@ -2854,8 +2856,11 @@ blink::WebMediaPlayer* RenderFrameImpl::createMediaPlayer(
 #endif  // defined(OS_ANDROID)
 
 #if BUILDFLAG(ENABLE_MEDIA_REMOTING)
-  remoting_controller_ptr->SetSwitchRendererCallback(base::Bind(
-      &media::WebMediaPlayerImpl::ScheduleRestart, media_player->AsWeakPtr()));
+  if (remoting_controller_ptr) {
+    remoting_controller_ptr->SetSwitchRendererCallback(
+        base::Bind(&media::WebMediaPlayerImpl::ScheduleRestart,
+                   media_player->AsWeakPtr()));
+  }
 #endif
   return media_player;
 }