Disable rendering when suspending on chrome os

ui/compositor/compositor.h

 // 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.
 
 #ifndef UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 164 matching lines @@
 
   // Where possible, draws are scissored to a damage region calculated from
   // changes to layer properties.  This bypasses that and indicates that
   // the whole frame needs to be drawn.
   void ScheduleFullRedraw();
 
   // Schedule redraw and append damage_rect to the damage region calculated
   // from changes to layer properties.
   void ScheduleRedrawRect(const gfx::Rect& damage_rect);
 
+  // Finishes all outstanding rendering and disables swapping on this surface.
+  void FinishAllRendering();
+
   // Finishes all outstanding rendering and disables swapping on this surface
   // until it is resized.
   void DisableSwapUntilResize();
 
   void SetLatencyInfo(const LatencyInfo& latency_info);
 
   // Sets the compositor's device scale factor and size.
   void SetScaleAndSize(float scale, const gfx::Size& size_in_pixel);
 
   // Returns the size of the widget that is being drawn to in pixel coordinates.
   const gfx::Size& size() const { return size_; }
 
   // Sets the background color used for areas that aren't covered by
   // the |root_layer|.
   void SetBackgroundColor(SkColor color);
 
-  // Set the visibility of the underlying compositor.
+  // Sets the visibility of the underlying compositor.
   void SetVisible(bool visible);
 
+  // Gets the visibility of the underlying compositor.
+  bool IsVisible();
+
   // Returns the widget for this compositor.
   gfx::AcceleratedWidget widget() const { return widget_; }
 
   // Returns the vsync manager for this compositor.
   scoped_refptr<CompositorVSyncManager> vsync_manager() const;
 
   // Returns the main thread task runner this compositor uses. Users of the
   // compositor generally shouldn't use this.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner() const {
     return task_runner_;
@@ skipping 117 matching lines @@
   LayerAnimatorCollection layer_animator_collection_;
 
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_