Handle ui::Layer's visibility using cc::Layer's m_isDrawable flag

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index b35cf0bdff2df6211a762a2325f6b980c16252a0..efcfcf474144fe1892a952b752160ff3256c56ed 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -341,6 +341,8 @@ class COMPOSITOR_EXPORT Layer
   // Set all filters which got applied to the layer background.
   void SetLayerBackgroundFilters();
 
+  void UpdateIsDrawn();
+
   const LayerType type_;
 
   Compositor* compositor_;
@@ -358,6 +360,7 @@ class COMPOSITOR_EXPORT Layer
 
   // Visibility of this layer. See SetVisible/IsDrawn for more details.
   bool visible_;
+  bool is_drawn_;

[piman, 2013/02/01 18:06:55]

nit: can you just add comment that explains that this is the computed value
gathered from the ancestors?

[ajuma, 2013/02/01 18:40:24]

Done.

 
   bool force_render_surface_;