[filemanager] Improved thumbnail update for changed files.

chrome/browser/resources/file_manager/js/file_manager.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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 1852 matching lines @@
   };
 
   FileManager.prototype.refreshCurrentDirectoryMetadata_ = function() {
     var entries = this.directoryModel_.getFileList().slice();
     // We don't pass callback here. When new metadata arrives, we have an
     // observer registered to update the UI.
 
     // TODO(dgozman): refresh content metadata only when modificationTime
     // changed.
     this.metadataCache_.clear(entries, 'filesystem|thumbnail|media');
-    this.metadataCache_.get(entries, 'filesystem|thumbnail', null);
+    this.metadataCache_.get(entries, 'filesystem', null);
     if (this.isOnGData()) {
       this.metadataCache_.clear(entries, 'gdata');
       this.metadataCache_.get(entries, 'gdata', null);
     }
+
+    var visibleItems = this.currentList_.items;
+    var visibleEntries = [];
+    for (var i = 0; i < visibleItems.length; i++) {
+      var index = this.currentList_.getIndexOfListItem(visibleItems[i]);
+      var entry = this.directoryModel_.getFileList().item(index);
+      visibleEntries.push(entry);
+    }
+    this.metadataCache_.get(visibleEntries, 'thumbnail', null);
   };
 
   FileManager.prototype.dailyUpdateModificationTime_ = function() {
     var fileList = this.directoryModel_.getFileList();
     var urls = [];
     for (var i = 0; i < fileList.length; i++) {
       urls.push(fileList.item(i).toURL());
     }
     this.metadataCache_.get(
         fileList.slice(), 'filesystem',
@@ skipping 1798 matching lines @@
     this.openWithCommand_.canExecuteChange();
 
     // TODO(dzvorygin): Here we use this hack, since 'hidden' is standard
     // attribute and we can't use it's setter as usual.
     this.openWithCommand_.__lookupSetter__('hidden').
         call(this.openWithCommand_, !(defaultItem && isMultiple));
     this.defaultActionMenuItem_.hidden = !defaultItem;
     defaultActionSeparator.hidden = !defaultItem;
   };
 })();