Add callback when queueing frame on Surface to create backpressure.

cc/surfaces/display.cc

Index: cc/surfaces/display.cc
diff --git a/cc/surfaces/display.cc b/cc/surfaces/display.cc
index df64a6c908cb60ef785802ca3ca61ea73f17e647..4e01b7069dda977a5def78c8427da3a838cfb42b 100644
--- a/cc/surfaces/display.cc
+++ b/cc/surfaces/display.cc
@@ -116,6 +116,13 @@ bool Display::Draw() {
                        disable_picture_quad_image_filtering);
   CompositorFrameMetadata metadata;
   renderer_->SwapBuffers(metadata);
+  for (std::set<SurfaceId>::iterator it = contained_surfaces_.begin();
+       it != contained_surfaces_.end();
+       ++it) {
+    Surface* surface = manager_->GetSurfaceForId(*it);
+    if (surface)
+      surface->RunDrawCallbacks();
+  }
   return true;
 }