cc: Compute target space transform dynamically

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 "element_id.proto";
 import "rectf.proto";
 import "scroll_offset.proto";
 import "size.proto";
@@ skipping 181 matching lines @@
       [packed = true];
   repeated TransformCachedNodeData cached_data = 9;
 }
 
 // Proto for data members of class EffectTree.
 message EffectTreeData {
   repeated int64 mask_replica_layer_ids = 1 [packed = true];
 }
 
 // Proto for class PropertyTrees.
-// NEXT ID: 16
+// NEXT ID: 17
 message PropertyTrees {
   optional PropertyTree transform_tree = 1;
   optional PropertyTree effect_tree = 2;
   optional PropertyTree clip_tree = 3;
   optional PropertyTree scroll_tree = 7;
 
   optional bool needs_rebuild = 4;
   optional bool non_root_surfaces_enabled = 5;
   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 bool verify_transform_tree_calculations = 16;
 
   optional Vector2dF inner_viewport_container_bounds_delta = 8;
   optional Vector2dF outer_viewport_container_bounds_delta = 9;
   optional Vector2dF inner_viewport_scroll_bounds_delta = 10;
   repeated int64 always_use_active_tree_opacity_effect_ids = 15 [packed = true];
 }