Adds a flag to support "Virtual Time" to the blink scheduler

components/scheduler/renderer/web_frame_host_scheduler_impl_unittest.cc

 // Copyright 2015 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 "components/scheduler/renderer/web_frame_host_scheduler_impl.h"
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
+#include "components/scheduler/base/test_time_source.h"
 #include "components/scheduler/child/scheduler_task_runner_delegate_for_test.h"
 #include "components/scheduler/renderer/renderer_scheduler_impl.h"
 #include "components/scheduler/renderer/web_frame_scheduler_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace scheduler {
 
 class WebFrameHostSchedulerImplTest : public testing::Test {
  public:
   WebFrameHostSchedulerImplTest() {}
   ~WebFrameHostSchedulerImplTest() override {}
 
   void SetUp() override {
     clock_.reset(new base::SimpleTestTickClock());
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     mock_task_runner_ = make_scoped_refptr(
         new cc::OrderedSimpleTaskRunner(clock_.get(), false));
-    main_task_runner_ =
-        SchedulerTaskRunnerDelegateForTest::Create(mock_task_runner_);
-    scheduler_.reset(new RendererSchedulerImpl(main_task_runner_));
+    main_task_runner_ = SchedulerTaskRunnerDelegateForTest::Create(
+        mock_task_runner_, make_scoped_ptr(new TestTimeSource(clock_.get())));
+    scheduler_.reset(new RendererSchedulerImpl(
+        main_task_runner_, RendererSchedulerImpl::TimeSource::NORMAL));
     frame_host_scheduler_.reset(
         new WebFrameHostSchedulerImpl(scheduler_.get()));
   }
 
   void TearDown() override {
     scheduler_->Shutdown();
   }
 
   scoped_ptr<base::SimpleTestTickClock> clock_;
   scoped_refptr<cc::OrderedSimpleTaskRunner> mock_task_runner_;
@@ skipping 11 matching lines @@
 
 TEST_F(WebFrameHostSchedulerImplTest, TestDestructionOfFrameSchedulersAfter) {
   scoped_ptr<blink::WebFrameScheduler> frame1(
       frame_host_scheduler_->createFrameScheduler());
   scoped_ptr<blink::WebFrameScheduler> frame2(
       frame_host_scheduler_->createFrameScheduler());
   frame_host_scheduler_.reset();
 }
 
 }  // namespace scheduler