cc: Abstract the LayerTreeHost.

cc/trees/layer_tree_host_unittest_remote_server.cc

 // Copyright 2016 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 <memory>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/animation/animation_host.h"
 #include "cc/test/fake_image_serialization_processor.h"
@@ skipping 51 matching lines @@
 
   // RemoteProtoChannel implementation
   void SetProtoReceiver(RemoteProtoChannel::ProtoReceiver* receiver) override {
     receiver_ = receiver;
   }
   void SendCompositorProto(const proto::CompositorMessage& proto) override {}
 
   int calls_received_;
   TestTaskGraphRunner task_graph_runner_;
   LayerTreeSettings settings_;
-  std::unique_ptr<LayerTreeHost> layer_tree_host_;
+  std::unique_ptr<LayerTreeHostInterface> layer_tree_host_;
   RemoteProtoChannel::ProtoReceiver* receiver_;
   std::unique_ptr<FakeImageSerializationProcessor>
       image_serialization_processor_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostTestRemoteServer);
 };
 
 class LayerTreeHostTestRemoteServerBeginMainFrame
     : public LayerTreeHostTestRemoteServer {
  protected:
   void BeginMainFrame(const BeginFrameArgs& args) override {
     calls_received_++;
   }
 };
 
 // Makes sure that the BeginMainFrame call is not aborted on the server.
 // See crbug.com/577301.
 TEST_F(LayerTreeHostTestRemoteServerBeginMainFrame, BeginMainFrameNotAborted) {
   layer_tree_host_->SetVisible(true);
 
   std::unique_ptr<BeginMainFrameAndCommitState> begin_frame_state;
   begin_frame_state.reset(new BeginMainFrameAndCommitState());
   begin_frame_state->scroll_info.reset(new ScrollAndScaleSet());
 
-  static_cast<ProxyMain*>(layer_tree_host_->proxy())
+  LayerTreeHost* layer_tree_host =
+      static_cast<LayerTreeHost*>(layer_tree_host_.get());
+  static_cast<ProxyMain*>(layer_tree_host->proxy())
       ->BeginMainFrame(std::move(begin_frame_state));
   EXPECT_EQ(calls_received_, 1);
 }
 
 }  // namespace
 }  // namespace cc