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

blimp/engine/renderer/blimp_content_renderer_client.cc

Index: blimp/engine/renderer/blimp_content_renderer_client.cc
diff --git a/blimp/engine/renderer/blimp_content_renderer_client.cc b/blimp/engine/renderer/blimp_content_renderer_client.cc
index dc60f1d3a04b4b60f5778ce2f1c0be2ce33c717a..e253728838ba394c6bc51331c41f3f18fc6195b5 100644
--- a/blimp/engine/renderer/blimp_content_renderer_client.cc
+++ b/blimp/engine/renderer/blimp_content_renderer_client.cc
@@ -6,6 +6,7 @@
 
 #include "base/memory/ptr_util.h"
 #include "blimp/engine/mojo/blob_channel.mojom.h"
+#include "blimp/engine/renderer/blimp_remote_compositor_bridge.h"
 #include "blimp/engine/renderer/blob_channel_sender_proxy.h"
 #include "blimp/engine/renderer/engine_image_serialization_processor.h"
 #include "components/web_cache/renderer/web_cache_impl.h"
@@ -28,5 +29,13 @@ BlimpContentRendererClient::GetImageSerializationProcessor() {
   return image_serialization_processor_.get();
 }
 
+std::unique_ptr<cc::RemoteCompositorBridge>
+BlimpContentRendererClient::CreateRemoteCompositorBridge(
+    cc::RemoteProtoChannel* remote_proto_channel,
+    scoped_refptr<base::SingleThreadTaskRunner> compositor_main_task_runner) {
+  return base::MakeUnique<BlimpRemoteCompositorBridge>(
+      remote_proto_channel, std::move(compositor_main_task_runner));
+}
+
 }  // namespace engine
 }  // namespace blimp