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

components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h

Index: components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
diff --git a/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h b/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
index aaffb916881e30c5a3fa875751260113c308a18c..b53df84b82c6d9924f9279ff9710644c1657a4ce 100644
--- a/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
+++ b/components/scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h
@@ -6,6 +6,7 @@
 #define COMPONENTS_SCHEDULER_TEST_LAZY_SCHEDULER_MESSAGE_LOOP_DELEGATE_FOR_TESTS_H_
 
 #include "base/message_loop/message_loop.h"
+#include "base/time/tick_clock.h"
 #include "components/scheduler/child/scheduler_task_runner_delegate.h"
 
 namespace scheduler {
@@ -34,6 +35,8 @@ class LazySchedulerMessageLoopDelegateForTests
                                   base::TimeDelta delay) override;
   bool RunsTasksOnCurrentThread() const override;
   bool IsNested() const override;
+  base::TimeTicks NowTicks() override;
+  void OnNoMoreWork() override;
 
  private:
   LazySchedulerMessageLoopDelegateForTests();
@@ -48,6 +51,7 @@ class LazySchedulerMessageLoopDelegateForTests
   // A task runner which hasn't yet been overridden in the message loop.
   mutable scoped_refptr<base::SingleThreadTaskRunner> pending_task_runner_;
   mutable scoped_refptr<base::SingleThreadTaskRunner> original_task_runner_;
+  scoped_ptr<base::TickClock> time_source_;
 
   DISALLOW_COPY_AND_ASSIGN(LazySchedulerMessageLoopDelegateForTests);
 };