content/blimp: Set up hooks for enabling LTHRemote in the renderer.

blimp/engine/renderer/blimp_content_renderer_client.h

Index: blimp/engine/renderer/blimp_content_renderer_client.h
diff --git a/blimp/engine/renderer/blimp_content_renderer_client.h b/blimp/engine/renderer/blimp_content_renderer_client.h
index 87e2078ec2d6d6aad2900b70e7461d18e14064b7..4cc42a5f1d614e7f10086792581ad79586251688 100644
--- a/blimp/engine/renderer/blimp_content_renderer_client.h
+++ b/blimp/engine/renderer/blimp_content_renderer_client.h
@@ -25,6 +25,10 @@ class BlimpContentRendererClient : public content::ContentRendererClient {
   // content::ContentRendererClient implementation.
   void RenderThreadStarted() override;
   cc::ImageSerializationProcessor* GetImageSerializationProcessor() override;
+  std::unique_ptr<cc::RemoteCompositorBridge> CreateRemoteCompositorBridge(
+      cc::RemoteProtoChannel* remote_proto_channel,
+      scoped_refptr<base::SingleThreadTaskRunner> compositor_main_task_runner)
+      override;
 
  private:
   // Manages the process-global web cache.