cc : Track transform animation changes on transform tree

cc/proto/property_tree.proto

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 syntax = "proto2";
 
 import "rectf.proto";
 import "scroll_offset.proto";
 import "size.proto";
 import "synced_property.proto";
 import "transform.proto";
 import "vector2df.proto";
 
 option optimize_for = LITE_RUNTIME;
 
 package cc.proto;
 
 // The messages declared in this file correspond to the classes declared in
 // cc/trees/property_tree.h
 
 // Proto for struct TransformNodeData.
-// NEXT ID: 42
+// NEXT ID: 43
 message TranformNodeData {
   optional Transform pre_local = 1;
   optional Transform local = 2;
   optional Transform post_local = 3;
   optional Transform to_parent = 4;
   optional Transform to_target = 5;
   optional Transform from_target = 6;
   optional Transform to_screen = 7;
   optional Transform from_screen = 8;
 
   optional int64 target_id = 9;
   optional int64 content_target_id = 10;
   optional int64 source_node_id = 11;
   optional bool needs_local_transform_update = 12;
   optional bool node_and_ancestors_are_animated_or_invertible = 41;
   optional bool is_invertible = 13;
   optional bool ancestors_are_invertible = 14;
-  optional bool is_animated = 15;
+  optional bool has_potential_animation = 15;
+  optional bool is_currently_animating = 42;
   optional bool to_screen_is_potentially_animated = 16;
   optional bool has_only_translation_animations = 17;
   optional bool to_screen_has_scale_animation = 18;
   optional bool flattens_inherited_transform = 19;
   optional bool node_and_ancestors_are_flat = 20;
   optional bool node_and_ancestors_have_only_integer_translation = 21;
   optional bool scrolls = 22;
   optional bool needs_sublayer_scale = 23;
   optional bool affected_by_inner_viewport_bounds_delta_x = 24;
   optional bool affected_by_inner_viewport_bounds_delta_y = 25;
@@ skipping 148 matching lines @@
   optional bool changed = 11;
   optional bool full_tree_damaged = 12;
   optional int64 sequence_number = 6;
   optional bool is_main_thread = 13;
   optional bool is_active = 14;
 
   optional Vector2dF inner_viewport_container_bounds_delta = 8;
   optional Vector2dF outer_viewport_container_bounds_delta = 9;
   optional Vector2dF inner_viewport_scroll_bounds_delta = 10;
 }