Gallery: Start to use new metadata model in Gallery.

ui/file_manager/gallery/js/gallery_data_model.js

 // Copyright 2015 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.
 
 /**
  * Data model for gallery.
  *
  * @param {!MetadataCache} metadataCache Metadata cache.
  * @param {!MetadataModel} metadataModel
  * @param {!EntryListWatcher=} opt_watcher Entry list watcher.
@@ skipping 83 matching lines @@
           event.metadata = item.getMetadata();
           this.dispatchEvent(event);
 
           if (!util.isSameEntry(oldEntry, item.getEntry())) {
             // New entry is added and the item now tracks it.
             // Add another item for the old entry.
             var anotherItem = new Gallery.Item(
                 oldEntry,
                 oldLocationInfo,
                 oldMetadata,
+                item.metadataItem_,

[yawano, 2015/03/03 04:14:50]

Is this item.metadataItem_ updated for the new file?

[hirono, 2015/03/04 05:07:04]

Actually this should be oldItemMetadata.
The behavior is:

1. Gallery apps create new entry
2. replace the item's entry with the new entry, 
3. Add new item for old entry.

This is for keeping selection of updated item.
Fixed.

[yawano, 2015/03/04 05:20:45]

I get it. Thank you!

                 this.metadataCache_,
                 this.metadataModel_,
                 item.isOriginal());
             // The item must be added behind the existing item so that it does
             // not change the index of the existing item.
             // TODO(hirono): Update the item index of the selection model
             // correctly.
             this.splice(this.indexOf(item) + 1, 0, anotherItem);
           }
 
@@ skipping 34 matching lines @@
         } else {
           // Force to free the buffer of the canvas by assigning zero size.
           sorted[i].screenImage.width = 0;
           sorted[i].screenImage.height = 0;
           sorted[i].screenImage = null;
         }
       }
     }
   }
 };