cc : Cache trasnforms to target even when target is a descendant

cc/trees/layer_tree_host_common_unittest.cc

 // Copyright 2011 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/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 9002 matching lines @@
   LayerImpl* root = root_layer_for_testing();
   LayerImpl* surface = AddChildToRoot<LayerImpl>();
   LayerImpl* clip_layer = AddChild<LayerImpl>(surface);
   LayerImpl* clip_parent = AddChild<LayerImpl>(clip_layer);
   LayerImpl* unclipped_desc_surface = AddChild<LayerImpl>(clip_parent);
   LayerImpl* clip_child = AddChild<LayerImpl>(unclipped_desc_surface);
 
   gfx::Transform translate;
   translate.Translate(10, 10);
 
+  gfx::Transform rotate;
+  rotate.RotateAboutXAxis(10);
+
   root->SetBounds(gfx::Size(100, 100));
   surface->SetBounds(gfx::Size(100, 100));
   surface->SetMasksToBounds(true);
   surface->test_properties()->force_render_surface = true;
+  surface->SetTransform(rotate);
   clip_layer->SetBounds(gfx::Size(20, 20));
   clip_layer->SetMasksToBounds(true);
   clip_parent->SetBounds(gfx::Size(50, 50));
   unclipped_desc_surface->SetTransform(translate);
   unclipped_desc_surface->SetBounds(gfx::Size(100, 100));
   unclipped_desc_surface->SetDrawsContent(true);
   unclipped_desc_surface->test_properties()->force_render_surface = true;
   clip_child->SetBounds(gfx::Size(100, 100));
   clip_child->SetDrawsContent(true);
 
@@ skipping 719 matching lines @@
   EXPECT_EQ(scroll_child6.id, grand_child10->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent3->scroll_tree_index());
   EXPECT_EQ(scroll_child7.id, child8->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent4->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, child9->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, grand_child12->scroll_tree_index());
 }
 
 }  // namespace
 }  // namespace cc