Update from https://crrev.com/311076

gpu/tools/compositor_model_bench/compositor_model_bench.cc

 // Copyright (c) 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.
 
 // This tool is used to benchmark the render model used by the compositor
 
 // Most of this file is derived from the source of the tile_render_bench tool,
 // and has been changed to  support running a sequence of independent
 // simulations for our different render models and test cases.
 
@@ skipping 68 matching lines @@
     XCloseDisplay(display_);
   }
 
   void QueueTest(const base::FilePath& path) {
     SimulationSpecification spec;
 
     // To get a std::string, we'll try to get an ASCII simulation name.
     // If the name of the file wasn't ASCII, this will give an empty simulation
     //  name, but that's not really harmful (we'll still warn about it though.)
     spec.simulation_name = path.BaseName().RemoveExtension().MaybeAsASCII();
-    if (spec.simulation_name == "") {
+    if (spec.simulation_name.empty()) {
       LOG(WARNING) << "Simulation for path " << path.LossyDisplayName() <<
         " will have a blank simulation name, since the file name isn't ASCII";
     }
     spec.input_path = path;
     spec.model_under_test = ForwardRenderModel;
     spec.frames_rendered = 0;
 
     sims_remaining_.push(spec);
 
     // The following lines are commented out pending the addition
@@ skipping 292 matching lines @@
     }
   } else {
     LOG(INFO) << "(input path is a file)";
     sim.QueueTest(inPath);
   }
 
   sim.Run();
 
   return 0;
 }