Use base::FooValue::From() to simplify gpu code.

gpu/tools/compositor_model_bench/forward_render_model.h

 // Copyright (c) 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.
 
 // A render model simulator for the original model used in Chromium.
 
 #ifndef GPU_TOOLS_COMPOSITOR_MODEL_BENCH_FORWARD_RENDER_MODEL_H_
 #define GPU_TOOLS_COMPOSITOR_MODEL_BENCH_FORWARD_RENDER_MODEL_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "gpu/tools/compositor_model_bench/render_model_utils.h"
 #include "gpu/tools/compositor_model_bench/render_models.h"
 
 class ForwardRenderNodeVisitor;
 
 class ForwardRenderSimulator : public RenderModelSimulator {
  public:
-  explicit ForwardRenderSimulator(RenderNode* root,
-                                  int window_width,
-                                  int window_height);
+  ForwardRenderSimulator(std::unique_ptr<RenderNode> root,
+                         int window_width,
+                         int window_height);
   ~ForwardRenderSimulator() override;
   void Update() override;
   void Resize(int width, int height) override;
 
  private:
   std::unique_ptr<ForwardRenderNodeVisitor> visitor_;
   std::unique_ptr<TextureGenerator> textures_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ForwardRenderSimulator);
 };
 
 #endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_FORWARD_RENDER_MODEL_H_