[scheduler] Add WakeupBudgetPool.

third_party/WebKit/Source/platform/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 "platform/scheduler/base/task_queue_impl.h"
 
 #include <utility>
 
 #include "base/format_macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 672 matching lines @@
   }
 
   base::AutoLock lock(immediate_incoming_queue_lock_);
   if (immediate_incoming_queue().empty())
     return true;
 
   return immediate_incoming_queue().front().enqueue_order() >
          main_thread_only().current_fence;
 }
 
+bool TaskQueueImpl::HasFence() const {
+  return !!main_thread_only().current_fence;
+}
+
 bool TaskQueueImpl::CouldTaskRun(EnqueueOrder enqueue_order) const {
   if (!IsQueueEnabled())
     return false;
 
   if (!main_thread_only().current_fence)
     return true;
 
   return enqueue_order < main_thread_only().current_fence;
 }
 
@@ skipping 192 matching lines @@
 }
 
 void TaskQueueImpl::NotifyWakeUpChangedOnMainThread(base::TimeTicks wake_up) {
   if (main_thread_only().observer)
     main_thread_only().observer->OnQueueNextWakeUpChanged(this, wake_up);
 }
 
 }  // namespace internal
 }  // namespace scheduler
 }  // namespace blink