Make disable vsync run the renderer independently

cc/trees/layer_tree_host_perftest.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/trees/layer_tree_host.h"
 
 #include <stdint.h>
 
 #include <sstream>
 
@@ skipping 28 matching lines @@
       : draw_timer_(kWarmupRuns,
                     base::TimeDelta::FromMilliseconds(kTimeLimitMillis),
                     kTimeCheckInterval),
         commit_timer_(0, base::TimeDelta(), 1),
         full_damage_each_frame_(false),
         begin_frame_driven_drawing_(false),
         measure_commit_cost_(false) {
   }
 
   void InitializeSettings(LayerTreeSettings* settings) override {
-    settings->wait_for_beginframe_interval = false;
+    // LayerTreeTests give the Display's BeginFrameSource directly to the
+    // LayerTreeHost like we do in the Browser process via
+    // TestDelegatingOutputSurface, so setting disable_display_vsync here
+    // unthrottles both the DisplayScheduler and the Scheduler.
     settings->renderer_settings.disable_display_vsync = true;
   }
 
   void BeginTest() override {
     BuildTree();
     PostSetNeedsCommitToMainThread();
   }
 
   void BeginMainFrame(const BeginFrameArgs& args) override {
     if (begin_frame_driven_drawing_ && !TestEnded()) {
@@ skipping 285 matching lines @@
 TEST_F(LayerTreeHostPerfTestJsonReader, HeavyPageThreaded) {
   begin_frame_driven_drawing_ = true;
   measure_commit_cost_ = true;
   SetTestName("heavy_page");
   ReadTestFile("heavy_layer_tree");
   RunTest(CompositorMode::THREADED);
 }
 
 }  // namespace
 }  // namespace cc