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

components/scheduler/renderer/webthread_impl_for_renderer_scheduler_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/webthread_impl_for_renderer_scheduler.h"
 
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/simple_test_tick_clock.h"
+#include "components/scheduler/base/test_time_source.h"
 #include "components/scheduler/child/scheduler_task_runner_delegate_impl.h"
 #include "components/scheduler/renderer/renderer_scheduler_impl.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebTaskRunner.h"
 #include "third_party/WebKit/public/platform/WebTraceLocation.h"
 
 namespace scheduler {
 namespace {
 
 const int kWorkBatchSize = 2;
 
 class MockTask : public blink::WebTaskRunner::Task {
  public:
   MOCK_METHOD0(run, void());
 };
 
 class MockTaskObserver : public blink::WebThread::TaskObserver {
  public:
   MOCK_METHOD0(willProcessTask, void());
   MOCK_METHOD0(didProcessTask, void());
 };
 }  // namespace
 
 class WebThreadImplForRendererSchedulerTest : public testing::Test {
  public:
   WebThreadImplForRendererSchedulerTest()
-      : scheduler_(SchedulerTaskRunnerDelegateImpl::Create(&message_loop_)),
+      : clock_(new base::SimpleTestTickClock()),
+        scheduler_(SchedulerTaskRunnerDelegateImpl::Create(
+                       &message_loop_,
+                       make_scoped_ptr(new TestTimeSource(clock_.get()))),
+                   RendererSchedulerImpl::TimeSource::NORMAL),
         default_task_runner_(scheduler_.DefaultTaskRunner()),
         thread_(&scheduler_) {}
 
   ~WebThreadImplForRendererSchedulerTest() override {}
 
   void SetWorkBatchSizeForTesting(size_t work_batch_size) {
     scheduler_.GetSchedulerHelperForTesting()->SetWorkBatchSizeForTesting(
         work_batch_size);
   }
 
   void TearDown() override { scheduler_.Shutdown(); }
 
  protected:
   base::MessageLoop message_loop_;
+  scoped_ptr<base::SimpleTestTickClock> clock_;
   RendererSchedulerImpl scheduler_;
   scoped_refptr<base::SingleThreadTaskRunner> default_task_runner_;
   WebThreadImplForRendererScheduler thread_;
 
   DISALLOW_COPY_AND_ASSIGN(WebThreadImplForRendererSchedulerTest);
 };
 
 TEST_F(WebThreadImplForRendererSchedulerTest, TestTaskObserver) {
   MockTaskObserver observer;
   thread_.addTaskObserver(&observer);
@@ skipping 122 matching lines @@
   }
 
   message_loop_.task_runner()->PostTask(
       FROM_HERE, base::Bind(&EnterRunLoop, base::Unretained(&message_loop_),
                             base::Unretained(&thread_)));
   message_loop_.RunUntilIdle();
   thread_.removeTaskObserver(&observer);
 }
 
 }  // namespace scheduler