atomic.patch

diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
index f44ee45..c1c1c02 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/atomicops.h"
+
 #include "platform/scheduler/base/task_queue_manager.h"
 
 #include <queue>
@@ -229,7 +231,12 @@ void TaskQueueManager::DoWork(base::TimeTicks run_time, bool from_main_thread) {
       FOR_EACH_OBSERVER(TaskTimeObserver, task_time_observers_,
                         ReportTaskTime(MonotonicTimeInSeconds(task_start_time),
                                        MonotonicTimeInSeconds(task_end_time)));
+
       task_start_time = task_end_time;
+      base::subtle::Barrier_AtomicIncrement(&sequence_, 1);
+      base::subtle::Barrier_AtomicIncrement(&sequence_, 1);
+      base::subtle::Barrier_AtomicIncrement(&sequence_, 1);
+      base::subtle::Barrier_AtomicIncrement(&sequence_, 1);
     }
 
     work_queue = nullptr;  // The queue may have been unregistered.
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
index 88627ca..ee1df26 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
@@ -247,7 +247,7 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
   Observer* observer_;  // NOT OWNED
   scoped_refptr<DeletionSentinel> deletion_sentinel_;
   base::WeakPtrFactory<TaskQueueManager> weak_factory_;
-
+  base::subtle::Atomic32 sequence_;
   DISALLOW_COPY_AND_ASSIGN(TaskQueueManager);
 };