cc: Introduce CompositorMode enum.

cc/layers/texture_layer_unittest.cc

 // Copyright 2012 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/texture_layer.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 56 matching lines @@
   }
 
   MOCK_METHOD0(SetNeedsCommit, void());
   MOCK_METHOD0(SetNeedsUpdateLayers, void());
   MOCK_METHOD0(StartRateLimiter, void());
   MOCK_METHOD0(StopRateLimiter, void());
 
  private:
   MockLayerTreeHost(FakeLayerTreeHostClient* client,
                     LayerTreeHost::InitParams* params)
-      : LayerTreeHost(params) {
+      : LayerTreeHost(params, CompositorMode::SingleThreaded) {
     InitializeSingleThreaded(client, base::ThreadTaskRunnerHandle::Get(),
                              nullptr);
   }
 };
 
 class FakeTextureLayerClient : public TextureLayerClient {
  public:
   FakeTextureLayerClient() : mailbox_changed_(true) {}
 
   bool PrepareTextureMailbox(
@@ skipping 1383 matching lines @@
   int callback_count_;
   scoped_refptr<Layer> root_;
   scoped_refptr<TextureLayer> layer_;
 };
 
 SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
     TextureLayerWithMailboxImplThreadDeleted);
 
 }  // namespace
 }  // namespace cc