Disable rendering when suspending on chrome os

ui/compositor/compositor.cc

 // Copyright (c) 2012 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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 210 matching lines @@
   host_->SetNeedsRedraw();
   host_->SetNeedsCommit();
 }
 
 void Compositor::ScheduleRedrawRect(const gfx::Rect& damage_rect) {
   // TODO(enne): Make this not commit.  See ScheduleFullRedraw.
   host_->SetNeedsRedrawRect(damage_rect);
   host_->SetNeedsCommit();
 }
 
+void Compositor::DisableSwap() {

[piman, 2015/02/11 02:48:22]

I'd prefer calling it FinishAllRendering(). It doesn't in itself disable swap.

[Chirantan Ekbote, 2015/02/18 02:47:13]

Done.

+  host_->FinishAllRendering();
+}
+
 void Compositor::DisableSwapUntilResize() {
   host_->FinishAllRendering();
   context_factory_->ResizeDisplay(this, gfx::Size());
 }
 
 void Compositor::SetLatencyInfo(const ui::LatencyInfo& latency_info) {
   scoped_ptr<cc::SwapPromise> swap_promise(
       new cc::LatencyInfoSwapPromise(latency_info));
   host_->QueueSwapPromise(swap_promise.Pass());
 }
@@ skipping 16 matching lines @@
 
 void Compositor::SetBackgroundColor(SkColor color) {
   host_->set_background_color(color);
   ScheduleDraw();
 }
 
 void Compositor::SetVisible(bool visible) {
   host_->SetVisible(visible);
 }
 
+bool Compositor::IsVisible() {
+  return host_->visible();
+}
+
 scoped_refptr<CompositorVSyncManager> Compositor::vsync_manager() const {
   return vsync_manager_;
 }
 
 void Compositor::AddObserver(CompositorObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void Compositor::RemoveObserver(CompositorObserver* observer) {
   observer_list_.RemoveObserver(observer);
@@ skipping 126 matching lines @@
                     observer_list_,
                     OnCompositingLockStateChanged(this));
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui