Add vsync notification command line switch

cc/trees/layer_tree_settings.cc

 // Copyright 2011 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/trees/layer_tree_settings.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "cc/base/switches.h"
 
 namespace cc {
 
 LayerTreeSettings::LayerTreeSettings()
     : acceleratePainting(false)
     , compositorFrameMessage(false)
     , implSidePainting(false)
     , renderVSyncEnabled(true)
+    , renderVSyncNotificationEnabled(false)
     , perTilePaintingEnabled(false)
     , partialSwapEnabled(false)
     , cacheRenderPassContents(true)
     , rightAlignedSchedulingEnabled(false)
     , acceleratedAnimationEnabled(true)
     , backgroundColorInsteadOfCheckerboard(false)
     , showOverdrawInTracing(false)
     , canUseLCDText(true)
     , shouldClearRootRenderPass(true)
     , useLinearFadeScrollbarAnimator(false)
@@ skipping 20 matching lines @@
 {
     // TODO(danakj): Renable surface caching when we can do it more realiably. crbug.com/170713
     cacheRenderPassContents = false;
 }
 
 LayerTreeSettings::~LayerTreeSettings()
 {
 }
 
 }  // namespace cc