[exp] cc: Introduce cc::CompositorMutator.

cc/layers/layer_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.h"
 
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/base/math_util.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/resources/layer_painter.h"
@@ skipping 23 matching lines @@
     code_to_test;                                                           \
     Mock::VerifyAndClearExpectations(layer_tree_host_.get());               \
   } while (false)
 
 namespace cc {
 namespace {
 
 class MockLayerTreeHost : public LayerTreeHost {
  public:
   explicit MockLayerTreeHost(FakeLayerTreeHostClient* client)
-      : LayerTreeHost(client, nullptr, nullptr, LayerTreeSettings()) {
+      : LayerTreeHost(client, nullptr, nullptr, nullptr, LayerTreeSettings()) {
     InitializeSingleThreaded(client,
                              base::MessageLoopProxy::current(),
                              nullptr);
   }
 
   MOCK_METHOD0(SetNeedsCommit, void());
   MOCK_METHOD0(SetNeedsUpdateLayers, void());
   MOCK_METHOD0(SetNeedsFullTreeSync, void());
 };
 
@@ skipping 873 matching lines @@
 
 class LayerTreeHostFactory {
  public:
   LayerTreeHostFactory()
       : client_(FakeLayerTreeHostClient::DIRECT_3D),
         shared_bitmap_manager_(new TestSharedBitmapManager),
         gpu_memory_buffer_manager_(new TestGpuMemoryBufferManager) {}
 
   scoped_ptr<LayerTreeHost> Create() {
     return LayerTreeHost::CreateSingleThreaded(
-               &client_,
-               &client_,
-               shared_bitmap_manager_.get(),
-               gpu_memory_buffer_manager_.get(),
-               LayerTreeSettings(),
-               base::MessageLoopProxy::current(),
-               nullptr);
+        &client_, &client_, shared_bitmap_manager_.get(),
+        gpu_memory_buffer_manager_.get(), nullptr, LayerTreeSettings(),
+        base::MessageLoopProxy::current(), nullptr);
   }
 
   scoped_ptr<LayerTreeHost> Create(LayerTreeSettings settings) {
     return LayerTreeHost::CreateSingleThreaded(
-               &client_,
-               &client_,
-               shared_bitmap_manager_.get(),
-               gpu_memory_buffer_manager_.get(),
-               settings,
-               base::MessageLoopProxy::current(),
-               nullptr);
+        &client_, &client_, shared_bitmap_manager_.get(),
+        gpu_memory_buffer_manager_.get(), nullptr, settings,
+        base::MessageLoopProxy::current(), nullptr);
   }
 
  private:
   FakeLayerTreeHostClient client_;
   scoped_ptr<TestSharedBitmapManager> shared_bitmap_manager_;
   scoped_ptr<TestGpuMemoryBufferManager> gpu_memory_buffer_manager_;
 };
 
 void AssertLayerTreeHostMatchesForSubtree(Layer* layer, LayerTreeHost* host) {
   EXPECT_EQ(host, layer->layer_tree_host());
@@ skipping 286 matching lines @@
   root_layer->AddChild(becomes_not_draws_content);
   EXPECT_EQ(0, root_layer->NumDescendantsThatDrawContent());
 
   becomes_draws_content->SetIsDrawable(true);
   root_layer->AddChild(becomes_draws_content);
   EXPECT_EQ(1, root_layer->NumDescendantsThatDrawContent());
 }
 
 }  // namespace
 }  // namespace cc