Add gdata content search to file_manager

chrome/browser/resources/file_manager/js/file_transfer_controller.js

 // 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.
 
 var MAX_DRAG_THUMBAIL_COUNT = 4;
 
 /**
  * Global (placed in the window object) variable name to hold internal
  * file dragging information. Needed to show visual feedback while dragging
  * since DataTransfer object is in protected state. Reachable from other
@@ skipping 382 matching lines @@
     // queryCommandEnabled returns true if event.returnValue is false.
     event.returnValue = !this.canPasteOrDrop_(event.clipboardData);
   },
 
   canPasteOrDrop_: function(dataTransfer, opt_destinationPath) {
     var destinationPath = opt_destinationPath ||
                           this.directoryModel_.getCurrentDirPath();
     if (this.directoryModel_.isPathReadOnly(destinationPath)) {
       return false;
     }
+    if (util.isSpecialReadonlyDirectory(destinationPath))
+      return false;
 
     if (!dataTransfer.types || dataTransfer.types.indexOf('fs/tag') == -1)
       return false;  // Unsupported type of content.
     if (dataTransfer.getData('fs/tag') == '') {
       // Data protected. Other checks are not possible but it makes sense to
       // let the user try.
       return true;
     }
 
     var directories = dataTransfer.getData('fs/directories').split('\n').
@@ skipping 108 matching lines @@
       return 'move';
     }
     if (event.dataTransfer.effectAllowed == 'copyMove' &&
         event.shiftKey) {
       return 'move';
     }
     return 'copy';
   }
 };