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

gpu/tools/compositor_model_bench/render_models.h

Index: gpu/tools/compositor_model_bench/render_models.h
diff --git a/gpu/tools/compositor_model_bench/render_models.h b/gpu/tools/compositor_model_bench/render_models.h
index cc17dcb3845e6a07f9e8fb0f1b1825f0976247c7..c68d5c69c3cdb7dc0aa7918f85a310b8bc5118ca 100644
--- a/gpu/tools/compositor_model_bench/render_models.h
+++ b/gpu/tools/compositor_model_bench/render_models.h
@@ -26,17 +26,19 @@ class RenderModelSimulator {
   virtual void Resize(int width, int height) = 0;
 
  protected:
-  explicit RenderModelSimulator(RenderNode* root);
+  explicit RenderModelSimulator(std::unique_ptr<RenderNode> root);
+
   std::unique_ptr<RenderNode> root_;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(RenderModelSimulator);
 };
 
-RenderModelSimulator* ConstructSimulationModel(RenderModel model,
-                                               RenderNode* render_tree_root,
-                                               int window_width,
-                                               int window_height);
+std::unique_ptr<RenderModelSimulator> ConstructSimulationModel(
+    RenderModel model,
+    std::unique_ptr<RenderNode> render_tree_root,
+    int window_width,
+    int window_height);
 
 #endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODELS_H_