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 (this.directoryModel_.isSearching())
+      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 61 matching lines @@
             entries.filter(function(e) {return e.isDirectory}).length == 0 &&
             props.filter(function(p) {return !p.availableOffline}).length == 0;
         // |Copy| is the only menu item affected by allGDataFilesAvailable.
         // It could be open right now, update its UI.
         this.copyCommand_.disabled = !this.canCopyOrDrag_();
       }.bind(this));
     }
   },
 
   get currentDirectory() {
-    return this.directoryModel_.getCurrentDirEntry();
+    return this.directoryModel_.getSearchOrCurrentDirEntry();

[SeRya, 2012/05/15 06:17:01]

currentDirectory doesn't make sense for search results. It's mostly used to
check if files gonna be pasted into the same directory thy have being coped
from. We don't allow paste to search results.

Ideally we should only set sourceDir if all the coped files are from the same
directory. However it would require resolving each entry name before putting it
into the collection.

I suggest to not set sourceDir for search results or set it to empty string.

[tbarzic, 2012/05/16 03:50:04]

setting sourceDir to empty string would break copy operations from search dirs
(we have some checks that expect it to be set), so I'd rather leave this as it
is, and maybe 
make the changes you proposed in a follow up patch (I'd hate to make this patch
more complex unless I really need to)

   },
 
   get readonly() {
     return this.directoryModel_.isReadOnly();
   },
 
   get isOnGData() {
     return this.directoryModel_.getRootType() == DirectoryModel.RootType.GDATA;
   },
 
@@ skipping 26 matching lines @@
       return 'move';
     }
     if (event.dataTransfer.effectAllowed == 'copyMove' &&
         event.shiftKey) {
       return 'move';
     }
     return 'copy';
   }
 };