cc: Make LayerTreeHost a protected Layer member.

cc/test/fake_layer_tree_host.h

 // Copyright 2013 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_FAKE_LAYER_TREE_HOST_H_
 #define CC_TEST_FAKE_LAYER_TREE_HOST_H_
 
 #include "cc/debug/micro_benchmark_controller.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_client.h"
@@ skipping 38 matching lines @@
   void SetNeedsCommit() override;
   void SetNeedsUpdateLayers() override {}
 
   void SetRootLayer(scoped_refptr<Layer> root_layer) {
     layer_tree_->SetRootLayer(root_layer);
   }
   Layer* root_layer() const { return layer_tree_->root_layer(); }
   PropertyTrees* property_trees() const {
     return layer_tree_->property_trees();
   }
+  void BuildPropertyTreesForTesting() {
+    layer_tree_->BuildPropertyTreesForTesting();
+  }
 
   LayerImpl* CommitAndCreateLayerImplTree();
   LayerImpl* CommitAndCreatePendingTree();
 
   FakeLayerTreeHostImpl* host_impl() { return &host_impl_; }
   LayerTreeImpl* active_tree() { return host_impl_.active_tree(); }
   LayerTreeImpl* pending_tree() { return host_impl_.pending_tree(); }
 
   using LayerTreeHost::ScheduleMicroBenchmark;
   using LayerTreeHost::SendMessageToMicroBenchmark;
@@ skipping 19 matching lines @@
   FakeImplTaskRunnerProvider task_runner_provider_;
   FakeLayerTreeHostClient* client_;
   TestSharedBitmapManager manager_;
   FakeLayerTreeHostImpl host_impl_;
   bool needs_commit_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_LAYER_TREE_HOST_H_