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

components/scheduler/child/scheduler_task_runner_delegate_for_test.h

Index: components/scheduler/child/scheduler_task_runner_delegate_for_test.h
diff --git a/components/scheduler/child/scheduler_task_runner_delegate_for_test.h b/components/scheduler/child/scheduler_task_runner_delegate_for_test.h
index 27c6309d850603c7af0e77c370726338c58b85ac..92581c060a653749a51fdccb5ddc533649eb0663 100644
--- a/components/scheduler/child/scheduler_task_runner_delegate_for_test.h
+++ b/components/scheduler/child/scheduler_task_runner_delegate_for_test.h
@@ -5,16 +5,18 @@
 #ifndef CONTENT_RENDERER_SCHEDULER_TASK_RUNNER_DELEGATE_FOR_TEST_H_
 #define CONTENT_RENDERER_SCHEDULER_TASK_RUNNER_DELEGATE_FOR_TEST_H_
 
+#include "base/test/simple_test_tick_clock.h"
 #include "components/scheduler/child/scheduler_task_runner_delegate.h"
 
 namespace scheduler {
 
-class NestableTaskRunnerForTest;
+class TaskQueueManagerDelegateForTest;
 
 class SchedulerTaskRunnerDelegateForTest : public SchedulerTaskRunnerDelegate {
  public:
   static scoped_refptr<SchedulerTaskRunnerDelegateForTest> Create(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      scoped_ptr<base::TickClock> time_source);
 
   // SchedulerTaskRunnerDelegate implementation
   void SetDefaultTaskRunner(
@@ -28,6 +30,8 @@ class SchedulerTaskRunnerDelegateForTest : public SchedulerTaskRunnerDelegate {
                                   base::TimeDelta delay) override;
   bool RunsTasksOnCurrentThread() const override;
   bool IsNested() const override;
+  base::TimeTicks NowTicks() override;
+  void OnNoMoreWork() override;
 
   base::SingleThreadTaskRunner* default_task_runner() const {
     return default_task_runner_.get();
@@ -37,12 +41,13 @@ class SchedulerTaskRunnerDelegateForTest : public SchedulerTaskRunnerDelegate {
   ~SchedulerTaskRunnerDelegateForTest() override;
 
  private:
-  explicit SchedulerTaskRunnerDelegateForTest(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+  SchedulerTaskRunnerDelegateForTest(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      scoped_ptr<base::TickClock> time_source);
 
   scoped_refptr<base::SingleThreadTaskRunner> default_task_runner_;
 
-  scoped_refptr<NestableTaskRunnerForTest> task_runner_;
+  scoped_refptr<TaskQueueManagerDelegateForTest> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerTaskRunnerDelegateForTest);
 };