support animated GIF

ui/file_manager/gallery/js/image_editor/image_adjust.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.
 
 /**
  * The base class for simple filters that only modify the image content
  * but do not modify the image dimensions.
  * @param {string} name
  * @param {string} title
  * @constructor
@@ skipping 114 matching lines @@
 
   // Update canvas size and/or transformation.
   if (!this.previewImageData_ ||
       this.viewportGeneration_ !== this.getViewport().getCacheGeneration()) {
     this.viewportGeneration_ = this.getViewport().getCacheGeneration();
 
     if (!this.canvas_)
       this.canvas_ = this.getImageView().createOverlayCanvas();
 
     this.getImageView().setupDeviceBuffer(this.canvas_);
-    this.originalImageData_ = this.getImageView().getScreenImageDataWith(
+    var canvas = this.getImageView().getImageCanvasWith(
         this.canvas_.width, this.canvas_.height);
-    this.previewImageData_ = this.getImageView().getScreenImageDataWith(
+    var context = canvas.getContext('2d');
+    this.originalImageData_ = context.getImageData(0, 0,
+        this.canvas_.width, this.canvas_.height);
+    this.previewImageData_ = context.getImageData(0, 0,
         this.canvas_.width, this.canvas_.height);
 
     isPreviewImageInvalidated = true;
   } else {
     this.getImageView().setTransform_(
         assert(this.canvas_), assert(this.getViewport()));
   }
 
   // Update preview image with applying filter.
   if (isPreviewImageInvalidated) {
@@ skipping 146 matching lines @@
 };
 
 ImageEditor.Mode.Sharpen.prototype =
     {__proto__: ImageEditor.Mode.Adjust.prototype};
 
 /** @override */
 ImageEditor.Mode.Sharpen.prototype.createTools = function(toolbar) {
   toolbar.addRange('strength', 'GALLERY_STRENGTH', 0, 0, 1, 100);
   toolbar.addRange('radius', 'GALLERY_RADIUS', 1, 1, 3);
 };