Prepare for per-webview virtual time

components/scheduler/child/scheduler_helper.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/child/scheduler_helper.h"
 
 #include "base/time/default_tick_clock.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "components/scheduler/base/task_queue_impl.h"
@@ skipping 137 matching lines @@
     observer_->OnUnregisterTaskQueue(queue);
 }
 
 void SchedulerHelper::OnTriedToExecuteBlockedTask(
     const TaskQueue& queue,
     const base::PendingTask& task) {
   if (observer_)
     observer_->OnTriedToExecuteBlockedTask(queue, task);
 }
 
+TaskQueue* SchedulerHelper::CurrentlyExecutingTaskQueue() const {
+  if (!task_queue_manager_)
+    return nullptr;
+  return task_queue_manager_->currently_executing_task_queue();
+}
+
 }  // namespace scheduler