cc: Fix draw transform computation for non-drawn layers

cc/trees/damage_tracker.cc

Index: cc/trees/damage_tracker.cc
diff --git a/cc/trees/damage_tracker.cc b/cc/trees/damage_tracker.cc
index 65d3fd321727bf62edaa4baa440fb172c59f027b..6c90c6c6b5f89e8d8391c5e6c69534a6517a9b95 100644
--- a/cc/trees/damage_tracker.cc
+++ b/cc/trees/damage_tracker.cc
@@ -298,7 +298,7 @@ void DamageTracker::ExtendDamageForLayer(LayerImpl* layer,
   damage_rect.Intersect(gfx::Rect(layer->bounds()));
   if (!damage_rect.IsEmpty()) {
     gfx::Rect damage_rect_in_target_space =
-        MathUtil::MapEnclosingClippedRect(layer->draw_transform(), damage_rect);
+        MathUtil::MapEnclosingClippedRect(layer->DrawTransform(), damage_rect);
     target_damage_rect->Union(damage_rect_in_target_space);
   }
 }