Disable rendering when suspending on chrome os

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 1897cc3e37f2f5e1d58b96bc4257e3051acf40c8..3c99a1640acadd7216a42382219fd1e316751cd5 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -182,6 +182,9 @@ class COMPOSITOR_EXPORT Compositor
   // 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();
@@ -198,9 +201,12 @@ class COMPOSITOR_EXPORT Compositor
   // 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_; }