cc : Cache trasnforms to target even when target is a descendant

cc/trees/draw_property_utils.cc

Index: cc/trees/draw_property_utils.cc
diff --git a/cc/trees/draw_property_utils.cc b/cc/trees/draw_property_utils.cc
index 44b5fa4b79fb729710ad770ba385bfa4636e2704..f101bffa848ec1df0b70557bfe12c860b69667f7 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -130,9 +130,8 @@ bool ComputeClipRectInTargetSpace(const LayerImpl* layer,
       return false;
     }
   } else {
-    if (property_trees->ComputeTransformToTarget(clip_node->target_transform_id,
-                                                 target_effect_node->id,
-                                                 &clip_to_target)) {
+    if (property_trees->ComputeTransformFromTarget(
+            target_node_id, clip_node->target_effect_id, &clip_to_target)) {

[jaydasika, 2016/08/11 22:05:51]

In this case, target_effect_node->id > clip_node->target_effect_id. So, calling
from target will make it avoid that path where we have to walk from source to
destination. 

       *clip_rect_in_target_space = MathUtil::ProjectClippedRect(
           clip_to_target, clip_node->clip_in_target_space);
     } else {