cc: Compute target space transform dynamically

cc/test/layer_tree_host_common_test.h

 // Copyright 2014 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.
 
 #ifndef CC_TEST_LAYER_TREE_HOST_COMMON_TEST_H_
 #define CC_TEST_LAYER_TREE_HOST_COMMON_TEST_H_
 
 #include <algorithm>
 #include <memory>
 #include <vector>
@@ skipping 140 matching lines @@
         .maximum_animation_scale;
   }
 
   static float GetStartingAnimationScale(LayerImpl* layer_impl) {
     return layer_impl->layer_tree_impl()
         ->property_trees()
         ->GetAnimationScales(layer_impl->transform_tree_index(),
                              layer_impl->layer_tree_impl())
         .starting_animation_scale;
   }
+
+  LayerTreeSettings LayerTreeHostCommonTestSettings() {
+    LayerTreeSettings settings;
+    settings.verify_transform_tree_calculations = true;
+    return settings;
+  }
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_LAYER_TREE_HOST_COMMON_TEST_H_