[exp] cc: Introduce cc::CompositorMutator.

cc/test/layer_tree_test.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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 217 matching lines @@
       Proxy* proxy,
       SharedBitmapManager* shared_bitmap_manager,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       RenderingStatsInstrumentation* stats_instrumentation)
       : LayerTreeHostImpl(settings,
                           host_impl_client,
                           proxy,
                           stats_instrumentation,
                           shared_bitmap_manager,
                           gpu_memory_buffer_manager,
+                          nullptr,
                           0),
         test_hooks_(test_hooks),
         block_notify_ready_to_activate_for_testing_(false),
         notify_ready_to_activate_was_blocked_(false) {}
 
   scoped_ptr<Rasterizer> CreateRasterizer() override {
     return test_hooks_->CreateRasterizer(this);
   }
 
   void CreateResourceAndTileTaskWorkerPool(
@@ skipping 249 matching lines @@
       return;
     LayerTreeHost::SetNeedsCommit();
   }
 
   void set_test_started(bool started) { test_started_ = started; }
 
  private:
   LayerTreeHostForTesting(TestHooks* test_hooks,
                           LayerTreeHostClient* client,
                           const LayerTreeSettings& settings)
-      : LayerTreeHost(client, NULL, NULL, settings),
+      : LayerTreeHost(client, NULL, NULL, NULL, settings),
         shared_bitmap_manager_(new TestSharedBitmapManager),
         gpu_memory_buffer_manager_(new TestGpuMemoryBufferManager),
         test_hooks_(test_hooks),
         test_started_(false) {}
 
   scoped_ptr<TestSharedBitmapManager> shared_bitmap_manager_;
   scoped_ptr<TestGpuMemoryBufferManager> gpu_memory_buffer_manager_;
   TestHooks* test_hooks_;
   bool test_started_;
 };
@@ skipping 354 matching lines @@
   return -1;
 }
 
 void LayerTreeTest::DestroyLayerTreeHost() {
   if (layer_tree_host_ && layer_tree_host_->root_layer())
     layer_tree_host_->root_layer()->SetLayerTreeHost(NULL);
   layer_tree_host_ = nullptr;
 }
 
 }  // namespace cc