Add SurfaceWillDraw notification

cc/surfaces/display_scheduler.cc

 // Copyright 2015 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/surfaces/display_scheduler.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/stl_util.h"
@@ skipping 296 matching lines @@
   TRACE_EVENT1("cc", "DisplayScheduler::SurfaceDamageExpected", "surface_id",
                surface_id.ToString());
   auto it = surface_states_.find(surface_id);
   if (it == surface_states_.end())
     return;
   it->second.last_args = args;
   if (UpdateHasPendingSurfaces())
     ScheduleBeginFrameDeadline();
 }
 
+void DisplayScheduler::OnSurfaceWillDraw(const SurfaceId& surface_id) {}
+
 base::TimeTicks DisplayScheduler::DesiredBeginFrameDeadlineTime() {
   if (output_surface_lost_) {
     TRACE_EVENT_INSTANT0("cc", "Lost output surface", TRACE_EVENT_SCOPE_THREAD);
     return base::TimeTicks();
   }
 
   if (pending_swaps_ >= max_pending_swaps_) {
     TRACE_EVENT_INSTANT0("cc", "Swap throttled", TRACE_EVENT_SCOPE_THREAD);
     return current_begin_frame_args_.frame_time +
            current_begin_frame_args_.interval;
@@ skipping 108 matching lines @@
 }
 
 void DisplayScheduler::DidReceiveSwapBuffersAck() {
   uint32_t swap_id = next_swap_id_ - pending_swaps_;
   pending_swaps_--;
   TRACE_EVENT_ASYNC_END0("cc", "DisplayScheduler:pending_swaps", swap_id);
   ScheduleBeginFrameDeadline();
 }
 
 }  // namespace cc