cc: Make LayerTreeTests use a DelegatingRenderer and Display.

cc/surfaces/display.cc

Index: cc/surfaces/display.cc
diff --git a/cc/surfaces/display.cc b/cc/surfaces/display.cc
index fe35c7b9d5185f615cd5dd13025a495cf1f6433a..9ded1a21c70bea9d719ff78c4395aef634831384 100644
--- a/cc/surfaces/display.cc
+++ b/cc/surfaces/display.cc
@@ -288,6 +288,8 @@ bool Display::DrawAndSwap() {
     should_draw = false;
   }
 
+  client_->DisplayWillDrawAndSwap(should_draw, frame_data->render_pass_list);
+
   if (should_draw) {
     gfx::Rect device_viewport_rect = external_viewport_.IsEmpty()
                                          ? gfx::Rect(current_surface_size_)
@@ -339,6 +341,7 @@ bool Display::DrawAndSwap() {
     DidSwapBuffersComplete();
   }
 
+  client_->DisplayDidDrawAndSwap();
   return true;
 }