[Reland] Per WebViewScheduler virtual time

components/scheduler/child/webthread_base.cc

 // Copyright 2014 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.
 
 // An implementation of WebThread in terms of base::MessageLoop and
 // base::Thread
 
 #include "components/scheduler/child/webthread_base.h"
 
 #include "base/bind.h"
@@ skipping 84 matching lines @@
                                      web_location.fileName(), -1, nullptr);
   IdleTaskRunner()->PostIdleTaskAfterWakeup(
       location, base::Bind(&WebThreadBase::RunWebThreadIdleTask,
                            base::Passed(make_scoped_ptr(idle_task))));
 }
 
 bool WebThreadBase::isCurrentThread() const {
   return TaskRunner()->BelongsToCurrentThread();
 }
 
+double WebThreadBase::virtualTimeSeconds() {
+  return base::Time::Now().ToDoubleT();
+}
+
+double WebThreadBase::monotonicallyIncreasingVirtualTimeSeconds() {
+  return base::TimeTicks::Now().ToInternalValue() /
+         static_cast<double>(base::Time::kMicrosecondsPerSecond);
+}
+
 }  // namespace scheduler