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..f7b5238e1beeb9bf049b429b1f937b178d832ed2 100644
--- a/components/scheduler/child/scheduler_task_runner_delegate_for_test.h
+++ b/components/scheduler/child/scheduler_task_runner_delegate_for_test.h
@@ -5,6 +5,7 @@
 #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 {
@@ -14,7 +15,8 @@ class NestableTaskRunnerForTest;
 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();
@@ -37,8 +41,9 @@ 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_;