Plumb overlay processing into DirectRenderer.

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index 1eb0fbc2af680bdfff66211567011f46c6e0a0d7..0eb2dcb5740c64ebd790b5f4c5c1179e844e1808 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -133,7 +133,11 @@ DirectRenderer::DirectRenderer(RendererClient* client,
                                ResourceProvider* resource_provider)
     : Renderer(client, settings),
       output_surface_(output_surface),
-      resource_provider_(resource_provider) {}
+      resource_provider_(resource_provider),
+      overlay_processor_(
+          new OverlayProcessor(output_surface, resource_provider)) {
+  overlay_processor_->Initialize();
+}
 
 DirectRenderer::~DirectRenderer() {}
 
@@ -218,6 +222,9 @@ void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
   frame.disable_picture_quad_image_filtering =
       disable_picture_quad_image_filtering;
 
+  overlay_processor_->ProcessForOverlays(render_passes_in_draw_order,
+                                         &frame.overlay_list);
+
   EnsureBackbuffer();
 
   // Only reshape when we know we are going to draw. Otherwise, the reshape