[Reland] Per WebViewScheduler virtual time

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"
 #include "components/scheduler/base/task_queue_manager_delegate.h"
 #include "components/scheduler/base/time_domain.h"
 #include "components/scheduler/base/work_queue.h"
@@ skipping 599 matching lines @@
   DCHECK(main_thread_checker_.CalledOnValidThread());
   if (time_domain == main_thread_only().time_domain)
     return;
 
   if (time_domain)
     main_thread_only().time_domain->MigrateQueue(this, time_domain);
   main_thread_only().time_domain = time_domain;
   any_thread().time_domain = time_domain;
 }
 
+TimeDomain* TaskQueueImpl::GetTimeDomain() const {
+  return main_thread_only().time_domain;
+}
+
 // static
 void TaskQueueImpl::QueueAsValueInto(const std::queue<Task>& queue,
                                      base::trace_event::TracedValue* state) {
   std::queue<Task> queue_copy(queue);
   while (!queue_copy.empty()) {
     TaskAsValueInto(queue_copy.front(), state);
     queue_copy.pop();
   }
 }
 
@@ skipping 22 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