Gallery.app: Update thumbnail when a file is edited on the photo editor.

ui/file_manager/gallery/js/slide_mode.js

 // Copyright 2014 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.
 
 'use strict';
 
 /**
  * Slide mode displays a single image and has a set of controls to navigate
  * between the images and to edit an image.
  *
@@ skipping 922 matching lines @@
 SlideMode.prototype.saveCurrentImage_ = function(callback) {
   var item = this.getSelectedItem();
   var oldEntry = item.getEntry();
   var canvas = this.imageView_.getCanvas();
 
   this.showSpinner_(true);
   var metadataEncoder = ImageEncoder.encodeMetadata(
       this.selectedImageMetadata_.media, canvas, 1 /* quality */);
   var selectedImageMetadata = ContentProvider.ConvertContentMetadata(
       metadataEncoder.getMetadata(), this.selectedImageMetadata_);
+  if (selectedImageMetadata.filesystem)
+    selectedImageMetadata.filesystem.modificationTime = new Date();
   this.selectedImageMetadata_ = selectedImageMetadata;
   this.metadataCache_.set(oldEntry,
                           Gallery.METADATA_TYPE,
                           selectedImageMetadata);
 
   item.saveToFile(
       this.context_.saveDirEntry,
       this.shouldOverwriteOriginal_(),
       canvas,
       metadataEncoder,
@@ skipping 385 matching lines @@
       done = true;
     }
   }.bind(this);
 };
 
 /**
  * If the user touched the image and moved the finger more than SWIPE_THRESHOLD
  * horizontally it's considered as a swipe gesture (change the current image).
  */
 SwipeOverlay.SWIPE_THRESHOLD = 100;