[fsp] Add support for creating directories.

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
@@ skipping 90 matching lines @@
 
   // Options for the <code>onReadFileRequested()</code> event.
   dictionary ReadFileRequestedOptions {
     DOMString fileSystemId;
     long requestId;
     long openRequestId;
     double offset;
     double length;
   };
 
+  // Options for the <code>onCreateDirectoryRequested()</code> event.
+  dictionary CreateDirectoryRequestedOptions {
+    DOMString fileSystemId;
+    long requestId;
+    DOMString directoryPath;
+    boolean exclusive;
+    boolean recursive;
+  };
+
   // 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 88 matching lines @@
         ProviderErrorCallback errorCallback);
 
     // Raised when contents of a file opened previously with <code>openRequestId
     // </code>. The results should be returned in chunks by calling <code>
     // successCallback</code> several times. In case of an error, <code>
     // errorCallback</code> must be called.
     [maxListeners=1] static void onReadFileRequested(
         ReadFileRequestedOptions options,
         FileDataCallback successCallback,
         ProviderErrorCallback errorCallback);
+
+    // Raised when creating a directory is requested. If <code>exclusive</code>
+    // is set to true, then the operation should fail if the target directory
+    // already exists. If <code>recursive</code> is true, then all of the
+    // missing directories on the directory path should be created.
+    [maxListeners=1, nodoc] static void onCreateDirectoryRequested(
+        CreateDirectoryRequestedOptions options,
+        ProviderSuccessCallback successCallback,
+        ProviderErrorCallback errorCallback);
   };
 };