UI impl side painting default on

ui/compositor/layer_delegate.h

Index: ui/compositor/layer_delegate.h
diff --git a/ui/compositor/layer_delegate.h b/ui/compositor/layer_delegate.h
index 9312e02af91308e02768b028c61ab2811592b1d0..b94931a2c99f2f37ca179d81cc64db1943c10316 100644
--- a/ui/compositor/layer_delegate.h
+++ b/ui/compositor/layer_delegate.h
@@ -19,7 +19,8 @@ namespace ui {
 class COMPOSITOR_EXPORT LayerDelegate {
  public:
   // Paint content for the layer to the specified canvas. It has already been
-  // clipped to the Layer's invalid rect.
+  // clipped to the Layer's invalid rect. In Impl-Side Painting, canvas's rect

[enne (OOO), 2015/03/02 21:59:27]

I think this comment change leaks implementation details of cc which may no
longer be true if ui switches to display lists.  I think you could just leave
it.

[weiliangc, 2015/03/02 22:37:22]

Done.

+  // would be to closest tile size.
   virtual void OnPaintLayer(gfx::Canvas* canvas) = 0;
 
   // A notification that this layer has had a delegated frame swap and