Implement chrome.downloads.drag()

chrome/common/extensions/api/downloads.idl

 // Copyright (c) 2012 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.
 
 [permissions=downloads]
 namespace downloads {
   [inline_doc] dictionary HeaderNameValuePair {
     // Name of the HTTP header.
     DOMString name;
 
@@ skipping 364 matching lines @@
     static void erase(DownloadQuery query, optional EraseCallback callback);
 
     // TODO(benjhayden) Comment.
     [nodoc] static void setDestination(long downloadId, DOMString relativePath);
 
     // Prompt the user to either accept or cancel a dangerous download.
     // <code>acceptDanger()</code> does not automatically accept dangerous
     // downloads.
     [nodoc] static void acceptDanger(long downloadId);
 
-    // Initiate dragging the file to another application.
-    [nodoc] static void drag(long downloadId);
+    // Initiate dragging the downloaded file to another application.
+    static void drag(long downloadId);
   };
 
   interface Events {
     // This event fires with the $ref:DownloadItem
     // object when a download begins.
     static void onCreated(DownloadItem downloadItem);
 
     // Fires with the <code>downloadId</code> when a download is erased from
     // history.
     // |downloadId|: The <code>id</code> of the $ref:DownloadItem that was erased.
     static void onErased(long downloadId);
 
     // When any of a $ref:DownloadItem's properties
     // except <code>bytesReceived</code> changes, this event fires with the
     // <code>downloadId</code> and an object containing the properties that changed.
     static void onChanged(DownloadDelta downloadDelta);
   };
 };