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 9bc7f884aa9e8789414749d74dc6235f2896d3ff..b4794bcd72649f6bc7fd063fc199c212b2afb5a3 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 DisableSwap();
+
   // Finishes all outstanding rendering and disables swapping on this surface
   // until it is resized.
   void DisableSwapUntilResize();
@@ -201,6 +204,9 @@ class COMPOSITOR_EXPORT Compositor
   // Set the visibility of the underlying compositor.
   void SetVisible(bool visible);
 
+  // Get the visibility of the underlying compositor.
+  bool IsVisible();
+
   // Returns the widget for this compositor.
   gfx::AcceleratedWidget widget() const { return widget_; }