cc : Move screen space scale factor to root transform node

cc/trees/property_tree_unittest.cc

 // 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.
 
 #include "cc/trees/property_tree.h"
 
 #include "cc/input/main_thread_scrolling_reason.h"
 #include "cc/proto/property_tree.pb.h"
 #include "cc/test/geometry_test_utils.h"
 #include "cc/trees/clip_node.h"
@@ skipping 1101 matching lines @@
   void StartTest() override {
     // This tests that to_target transform is not snapped when it has a singular
     // transform.
     PropertyTrees property_trees;
     TransformTree& tree = property_trees.transform_tree;
     EffectTree& effect_tree = property_trees.effect_tree;
 
     int parent = tree.Insert(TransformNode(), 0);
     int effect_parent = effect_tree.Insert(EffectNode(), 0);
     effect_tree.Node(effect_parent)->has_render_surface = true;
+    effect_tree.Node(effect_parent)->surface_contents_scale =
+        gfx::Vector2dF(1.f, 1.f);
+
     tree.SetTargetId(parent, parent);
     tree.Node(parent)->scrolls = true;
     tree.Node(parent)->source_node_id = 0;
 
     int child = tree.Insert(TransformNode(), parent);
     TransformNode* child_node = tree.Node(child);
     tree.SetTargetId(child, parent);
     child_node->scrolls = true;
     child_node->local.Scale3d(6.0f, 6.0f, 0.0f);
     child_node->local.Translate(1.3f, 1.3f);
@@ skipping 22 matching lines @@
 
 DIRECT_AND_SERIALIZED_PROPERTY_TREE_TEST_F(
     PropertyTreeTestSingularTransformSnapTest);
 
 #undef DIRECT_AND_SERIALIZED_PROPERTY_TREE_TEST_F
 #undef SERIALIZED_PROPERTY_TREE_TEST_F
 #undef DIRECT_PROPERTY_TREE_TEST_F
 
 }  // namespace
 }  // namespace cc