Add SurfaceWillDraw notification

cc/test/fake_surface_observer.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/fake_surface_observer.h"
 
 namespace cc {
 
 FakeSurfaceObserver::FakeSurfaceObserver(bool damage_display)
     : damage_display_(damage_display) {}
 
 FakeSurfaceObserver::~FakeSurfaceObserver() {}
 
 void FakeSurfaceObserver::Reset() {
   last_ack_ = BeginFrameAck();
   damaged_surfaces_.clear();
+  will_draw_surfaces_.clear();
   last_surface_info_ = SurfaceInfo();
   last_created_surface_id_ = SurfaceId();
 }
 
 bool FakeSurfaceObserver::IsSurfaceDamaged(const SurfaceId& surface_id) const {
   return damaged_surfaces_.count(surface_id) > 0;
 }
 
+bool FakeSurfaceObserver::SurfaceWillDrawCalled(
+    const SurfaceId& surface_id) const {
+  return will_draw_surfaces_.count(surface_id) > 0;
+}
+
 bool FakeSurfaceObserver::OnSurfaceDamaged(const SurfaceId& surface_id,
                                            const BeginFrameAck& ack) {
   if (ack.has_damage)
     damaged_surfaces_.insert(surface_id);
   last_ack_ = ack;
   return ack.has_damage && damage_display_;
 }
 
+void FakeSurfaceObserver::OnSurfaceWillDraw(const SurfaceId& surface_id) {
+  will_draw_surfaces_.insert(surface_id);
+}
+
 void FakeSurfaceObserver::OnSurfaceCreated(const SurfaceInfo& surface_info) {
   last_created_surface_id_ = surface_info.id();
   last_surface_info_ = surface_info;
 }
 
 }  // namespace cc