cc: Compute animation scale on demand

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 d46151d683598cdf8f0e0e53c3f8ae36c3585c0e..50c2b90e22594d9278645725e350df498b70e5f3 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -1209,17 +1209,6 @@ void ComputeLayerDrawProperties(LayerImpl* layer,
   }
   layer->draw_properties().screen_space_transform_is_animating =
       transform_node->data.to_screen_is_potentially_animated;
-  if (layer->layer_tree_impl()
-          ->settings()
-          .layer_transforms_should_scale_layer_contents) {
-    layer->draw_properties().maximum_animation_contents_scale =
-        transform_node->data.combined_maximum_animation_target_scale;
-    layer->draw_properties().starting_animation_contents_scale =
-        transform_node->data.combined_starting_animation_scale;
-  } else {
-    layer->draw_properties().maximum_animation_contents_scale = 0.f;
-    layer->draw_properties().starting_animation_contents_scale = 0.f;

[ajuma, 2016/06/29 15:04:37]

Please make sure the new logic also uses scale 0 when
layer_transforms_should_scale_layer_contents is false (and please add a test for
this if we don't already have one).

[sunxd, 2016/06/30 15:29:44]

Done.

-  }
 
   layer->draw_properties().opacity =
       LayerDrawOpacity(layer, property_trees->effect_tree);