Fix aborting in throttled file system (FSP).

chrome/browser/chromeos/file_system_provider/queue.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_QUEUE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_QUEUE_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 45 matching lines @@
   // such case, Abort() must not be called.
   void Enqueue(size_t token, const AbortableCallback& callback);
 
   // Forcibly aborts a previously enqueued task. May be called at any time as
   // long as the task is still in the queue and is not marked as completed.
   // Note, that Remove() must be called in order to remove the task from the
   // queue. Must not be called if the task doesn't support aborting (it's
   // abort callback is NULL).
   void Abort(size_t token);
 
+  // Returns true if the task which is in the queue with |token| has been
+  // aborted. This method must not be called for tasks which are not in the
+  // queue.
+  bool IsAborted(size_t token);
+
   // Marks the previously enqueued task as complete. Must be called for each
   // enqueued task (unless aborted). Note, that Remove() must be called in order
   // to remove the task from the queue if it hasn't been aborted earlier.
   // It must not be called more than one, nor for aborted tasks.
   void Complete(size_t token);
 
   // Removes the previously enqueued and completed or aborted task from the
   // queue. Must not be called more than once.
   void Remove(size_t token);
 
@@ skipping 21 matching lines @@
   std::map<int, Task> aborted_;
 
   base::WeakPtrFactory<Queue> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(Queue);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_QUEUE_H_