[fsp] Add support for aborting running operations.

chrome/common/extensions/api/file_system_provider.idl

 // Copyright 2013 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.
 
 // Use the <code>chrome.fileSystemProvider</code> API to create file systems,
 // that can be accessible from the file manager on Chrome OS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h"]
 namespace fileSystemProvider {
   // Error codes used by providing extensions in response to requests. For
   // success, <code>OK</code> should be used.
   enum ProviderError {
     OK,
     FAILED,
     IN_USE,
     EXISTS,
     NOT_FOUND,
     ACCESS_DENIED,
     TOO_MANY_OPENED,
     NO_MEMORY,
     NO_SPACE,
     NOT_A_DIRECTORY,
     INVALID_OPERATION,
     SECURITY,
-    ABORT,
     NOT_A_FILE,
     NOT_EMPTY,
     INVALID_URL,
     IO
   };
 
   // Mode of opening a file. Used by <code>onOpenFileRequested</code>.
   enum OpenFileMode {
     READ,
     WRITE
@@ skipping 124 matching lines @@
   // Options for the <code>onWriteFileRequested()</code> event.
   dictionary WriteFileRequestedOptions {
     DOMString fileSystemId;
     long requestId;
     long openRequestId;
     double offset;
     double length;
     ArrayBuffer data;
   };
 
+  // Options for the <code>onAbortRequested()</code> event.
+  dictionary AbortRequestedOptions {
+    DOMString fileSystemId;
+    long requestId;
+    long operationRequestId;
+  };
+
   // Callback to receive the result of mount() function.
   callback MountCallback = void([nodoc, instanceOf=DOMError] object error);
 
   // Callback to receive the result of unmount() function.
   callback UnmountCallback = void([nodoc, instanceOf=DOMError] object error);
 
   // Callback to handle an error raised from the browser.
   [nocompile] callback ErrorCallback = void([instanceOf=DOMError] object error);
 
   // Callback to be called by the providing extension in case of a success.
@@ skipping 141 matching lines @@
         TruncateRequestedOptions options,
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);
 
     // Raised when writing contents to a file opened previously with <code>
     // openRequestId</code> is requested.
     [maxListeners=1, nodoc] static void onWriteFileRequested(
         WriteFileRequestedOptions options,
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);
+
+    // Raised when aborting an operation with <code>operationRequestId</code>
+    // is requested. The operation executed with <code>operationRequestId</code>
+    // should be immediately stopped and <code>successCallback</code> of this
+    // abort request executed. If aborting fails, then <code>errorCallback
+    // </code> must be called. Note, that callbacks of the aborted operation
+    // should not be called, as they will be ignored. Despite calling <code>
+    // errorCallback</code>, the request may be forcibly aborted. 
+    [maxListeners=1, nodoc] static void onAbortRequested(
+        AbortRequestedOptions options,
+        ProviderSuccessCallback successCallback,
+        ProviderErrorCallback errorCallback);
   };
 };