Reland "Check for semaphore alignment on posix platforms. (patchset #1 id:1 of https://codereview.c…

src/libplatform/task-queue.h

Index: src/libplatform/task-queue.h
diff --git a/src/libplatform/task-queue.h b/src/libplatform/task-queue.h
index efe9e07e0668efce6f2f62ab1c37d41527df13c4..24b68da04b661eb9cf5be3ba9a18fb1788431f3a 100644
--- a/src/libplatform/task-queue.h
+++ b/src/libplatform/task-queue.h
@@ -33,8 +33,8 @@ class TaskQueue {
   void Terminate();
 
  private:
-  base::Mutex lock_;
   base::Semaphore process_queue_semaphore_;
+  base::Mutex lock_;
   std::queue<Task*> task_queue_;
   bool terminated_;