Splitting of layers for correct intersections

cc/trees/layer_tree_impl_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/layer_tree_impl.h"
 
 #include "cc/layers/heads_up_display_layer_impl.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
 #include "cc/test/fake_impl_proxy.h"
@@ skipping 902 matching lines @@
   host_impl().SetViewportSize(root->bounds());
   host_impl().active_tree()->SetRootLayer(root.Pass());
   host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
 
   // Sanity check the scenario we just created.
   ASSERT_TRUE(child1);
   ASSERT_TRUE(child2);
   ASSERT_TRUE(grand_child1);
   ASSERT_EQ(1u, RenderSurfaceLayerList().size());
 
-  RenderSurfaceImpl* root_render_surface =
-      host_impl().active_tree()->root_layer()->render_surface();
-  ASSERT_EQ(4u, root_render_surface->layer_list().size());
-  ASSERT_EQ(3, root_render_surface->layer_list().at(0)->id());
-  ASSERT_EQ(1, root_render_surface->layer_list().at(1)->id());
-  ASSERT_EQ(2, root_render_surface->layer_list().at(2)->id());
-  ASSERT_EQ(4, root_render_surface->layer_list().at(3)->id());
-
   // Nothing overlaps the root_layer at (1, 1), so hit testing there should find
   // the root layer.
   gfx::Point test_point = gfx::Point(1, 1);
   LayerImpl* result_layer =
       host_impl().active_tree()->FindLayerThatIsHitByPoint(test_point);
   ASSERT_TRUE(result_layer);
   EXPECT_EQ(1, result_layer->id());
 
   // At (15, 15), child1 and root are the only layers. child1 is expected to be
   // on top.
@@ skipping 1216 matching lines @@
   EXPECT_EQ(0u, host_impl().active_tree()->NumLayers());
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 1);
   root->AddChild(LayerImpl::Create(host_impl().active_tree(), 2));
   root->AddChild(LayerImpl::Create(host_impl().active_tree(), 3));
   root->child_at(1)->AddChild(LayerImpl::Create(host_impl().active_tree(), 4));
   EXPECT_EQ(4u, host_impl().active_tree()->NumLayers());
 }
 
 }  // namespace
 }  // namespace cc