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

components/scheduler/base/task_queue_impl.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/base/task_queue_impl.h"
 
 #include "components/scheduler/base/task_queue_manager.h"
 
 namespace scheduler {
 namespace internal {
@@ skipping 85 matching lines @@
   return PostDelayedTaskImpl(from_here, task, delay, TaskType::NON_NESTABLE);
 }
 
 bool TaskQueueImpl::PostDelayedTaskAt(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
     base::TimeTicks desired_run_time) {
   base::AutoLock lock(any_thread_lock_);
   if (!any_thread().task_queue_manager)
     return false;
-  LazyNow lazy_now(any_thread().task_queue_manager);
+  LazyNow lazy_now(any_thread().task_queue_manager->tick_clock());
   return PostDelayedTaskLocked(&lazy_now, from_here, task, desired_run_time,
                                TaskType::NORMAL);
 }
 
 bool TaskQueueImpl::PostDelayedTaskImpl(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
     base::TimeDelta delay,
     TaskType task_type) {
   base::AutoLock lock(any_thread_lock_);
   if (!any_thread().task_queue_manager)
     return false;
-  LazyNow lazy_now(any_thread().task_queue_manager);
+  LazyNow lazy_now(any_thread().task_queue_manager->tick_clock());
   base::TimeTicks desired_run_time;
   if (delay > base::TimeDelta())
     desired_run_time = lazy_now.Now() + delay;
   return PostDelayedTaskLocked(&lazy_now, from_here, task, desired_run_time,
                                task_type);
 }
 
 bool TaskQueueImpl::PostDelayedTaskLocked(
     LazyNow* lazy_now,
     const tracked_objects::Location& from_here,
@@ skipping 184 matching lines @@
       any_thread().pump_policy != PumpPolicy::AUTO) {
     PumpQueueLocked();
   }
   any_thread().pump_policy = pump_policy;
 }
 
 void TaskQueueImpl::PumpQueueLocked() {
   if (!any_thread().task_queue_manager)
     return;
 
-  LazyNow lazy_now(any_thread().task_queue_manager);
+  LazyNow lazy_now(any_thread().task_queue_manager->tick_clock());
   MoveReadyDelayedTasksToIncomingQueueLocked(&lazy_now);
 
   bool was_empty = main_thread_only().work_queue.empty();
   while (!any_thread().incoming_queue.empty()) {
     // TODO(alexclarke): consider std::move() when allowed.
     main_thread_only().work_queue.push(any_thread().incoming_queue.front());
     any_thread().incoming_queue.pop();
   }
   // |incoming_queue| is now empty so TaskQueueManager::UpdateQueues no longer
   // needs to consider this queue for reloading.
@@ skipping 175 matching lines @@
   state->SetBoolean("nestable", task.nestable);
   state->SetBoolean("is_high_res", task.is_high_res);
   state->SetDouble(
       "delayed_run_time",
       (task.delayed_run_time - base::TimeTicks()).InMicroseconds() / 1000.0L);
   state->EndDictionary();
 }
 
 }  // namespace internal
 }  // namespace scheduler