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

gpu/tools/compositor_model_bench/render_models.cc

 // 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.
 
 #include "gpu/tools/compositor_model_bench/render_models.h"
 
 #include <string>
+#include <utility>
 
+#include "base/memory/ptr_util.h"
 #include "gpu/tools/compositor_model_bench/forward_render_model.h"
 
 const char* ModelToString(RenderModel m) {
   switch (m) {
     case ForwardRenderModel:
       return "Forward Rendering";
     default:
       return "(unknown render model name)";
   }
 }
 
-RenderModelSimulator::RenderModelSimulator(RenderNode* root) : root_(root) {
-}
+RenderModelSimulator::RenderModelSimulator(std::unique_ptr<RenderNode> root)
+    : root_(std::move(root)) {}
 
 RenderModelSimulator::~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) {
   switch (model) {
     case ForwardRenderModel:
-      return new ForwardRenderSimulator(render_tree_root,
-                                        window_width,
-                                        window_height);
+      return base::WrapUnique(new ForwardRenderSimulator(
+          std::move(render_tree_root), window_width, window_height));
     default:
       LOG(ERROR) << "Unrecognized render model. "
         "If we know its name, then it's..." << ModelToString(model);
-      return 0;
+      return nullptr;
   }
 }
-