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

blimp/engine/BUILD.gn

Index: blimp/engine/BUILD.gn
diff --git a/blimp/engine/BUILD.gn b/blimp/engine/BUILD.gn
index 57178d12da3cbe63e2a7813ba2687948bde60d5e..0af29b0591a3f68b303f7ea62621f6509b9f5398 100644
--- a/blimp/engine/BUILD.gn
+++ b/blimp/engine/BUILD.gn
@@ -312,10 +312,14 @@ source_set("renderer") {
     "renderer/blimp_content_renderer_client.h",
     "renderer/blimp_engine_picture_cache.cc",
     "renderer/blimp_engine_picture_cache.h",
+    "renderer/blimp_remote_compositor_bridge.cc",
+    "renderer/blimp_remote_compositor_bridge.h",
     "renderer/blob_channel_sender_proxy.cc",
     "renderer/blob_channel_sender_proxy.h",
     "renderer/engine_image_serialization_processor.cc",
     "renderer/engine_image_serialization_processor.h",
+    "renderer/scheduler.cc",
+    "renderer/scheduler.h",
   ]
 
   deps = [
@@ -502,6 +506,7 @@ source_set("renderer_unit_tests") {
   sources = [
     "renderer/blimp_engine_picture_cache_unittest.cc",
     "renderer/blob_channel_sender_proxy_unittest.cc",
+    "renderer/scheduler_unittest.cc",
   ]
 
   deps = [