cc: Directly use property trees to calculate clip rect

cc/layers/layer_impl_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/layers/layer_impl.h"
 
 #include "cc/animation/mutable_properties.h"
 #include "cc/layers/painted_scrollbar_layer_impl.h"
 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
 #include "cc/output/filter_operation.h"
@@ skipping 511 matching lines @@
   ScrollTree* scroll_tree(LayerImpl* layer_impl) {
     return &layer_impl->layer_tree_impl()->property_trees()->scroll_tree;
   }
 
   LayerTreeHostImpl& host_impl() { return host_impl_; }
 
   LayerTreeImpl* tree() { return host_impl_.active_tree(); }
 
   LayerTreeSettings settings() {
     LayerTreeSettings settings;
+    settings.verify_clip_tree_calculations = true;
     return settings;
   }
 
  private:
   FakeImplTaskRunnerProvider task_runner_provider_;
   TestSharedBitmapManager shared_bitmap_manager_;
   TestTaskGraphRunner task_graph_runner_;
   FakeLayerTreeHostImpl host_impl_;
   int root_id_;
 };
@@ skipping 124 matching lines @@
 
   pending_layer->PushPropertiesTo(layer());
 
   EXPECT_VECTOR_EQ(gfx::Vector2dF(22, 23), layer()->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(layer()->CurrentScrollOffset(),
                    pending_layer->CurrentScrollOffset());
 }
 
 }  // namespace
 }  // namespace cc