Fix GN build after r323361 (two changes collided).

mojo/services/surfaces/surfaces_scheduler.cc

 // Copyright 2014 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 "mojo/services/surfaces/surfaces_scheduler.h"
 
 #include "cc/surfaces/display.h"
 
 namespace surfaces {
 
@@ skipping 67 matching lines @@
 void SurfacesScheduler::ScheduledActionActivateSyncTree() {
 }
 
 void SurfacesScheduler::ScheduledActionBeginOutputSurfaceCreation() {
   scheduler_->DidCreateAndInitializeOutputSurface();
 }
 
 void SurfacesScheduler::ScheduledActionPrepareTiles() {
 }
 
+void SurfacesScheduler::ScheduledActionInvalidateOutputSurface() {
+}
+
 void SurfacesScheduler::DidAnticipatedDrawTimeChange(base::TimeTicks time) {
 }
 
 base::TimeDelta SurfacesScheduler::DrawDurationEstimate() {
   return draw_estimate_;
 }
 
 base::TimeDelta SurfacesScheduler::BeginMainFrameToCommitDurationEstimate() {
   return base::TimeDelta();
 }
 
 base::TimeDelta SurfacesScheduler::CommitToActivateDurationEstimate() {
   return base::TimeDelta();
 }
 
 void SurfacesScheduler::DidBeginImplFrameDeadline() {
 }
 
 void SurfacesScheduler::SendBeginFramesToChildren(
     const cc::BeginFrameArgs& args) {
 }
 
 void SurfacesScheduler::SendBeginMainFrameNotExpectedSoon() {
 }
 
 }  // namespace mojo