support animated GIF

ui/file_manager/gallery/js/image_editor/image_editor.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.
 
 /**
  * ImageEditor is the top level object that holds together and connects
  * everything needed for image editing.
  *
  * @param {!Viewport} viewport The viewport.
  * @param {!ImageView} imageView The ImageView containing the images to edit.
@@ skipping 207 matching lines @@
 
   var self = this;
   this.imageView_.load(
       item, effect, displayCallback, function(loadType, delay, error) {
         self.lockUI(false);
 
         // Always handle an item as original for new session.
         item.setAsOriginal();
 
         self.commandQueue_ = new CommandQueue(
-            self.container_.ownerDocument, assert(self.imageView_.getCanvas()),
+            self.container_.ownerDocument, assert(self.imageView_.getImage()),
             saveFunction);
         self.commandQueue_.attachUI(
             self.getImageView(), self.getPrompt(), self.filesToast_,
             self.updateUndoRedo.bind(self), self.lockUI.bind(self));
         self.updateUndoRedo();
         loadCallback(loadType, delay, error);
       });
 };
 
 /**
@@ skipping 81 matching lines @@
  * Update Undo/Redo buttons state.
  */
 ImageEditor.prototype.updateUndoRedo = function() {
   var canUndo = this.commandQueue_ && this.commandQueue_.canUndo();
   var canRedo = this.commandQueue_ && this.commandQueue_.canRedo();
   ImageUtil.setAttribute(this.undoButton_, 'disabled', !canUndo);
   ImageUtil.setAttribute(this.redoButton_, 'disabled', !canRedo);
 };
 
 /**
- * @return {HTMLCanvasElement} The current image canvas.
+ * @return {HTMLCanvasElement|HTMLImageElement} The current image.
  */
-ImageEditor.prototype.getCanvas = function() {
-  return this.getImageView().getCanvas();
+ImageEditor.prototype.getImage = function() {
+  return this.getImageView().getImage();
 };
 
 /**
  * @return {!ImageBuffer} ImageBuffer instance.
  */
 ImageEditor.prototype.getBuffer = function() { return this.buffer_; };
 
 /**
  * @return {!ImageView} ImageView instance.
  */
@@ skipping 1175 matching lines @@
 
 /**
  * Hide the prompt.
  */
 ImageEditor.Prompt.prototype.hide = function() {
   if (!this.prompt_) return;
   this.prompt_.setAttribute('state', 'fadeout');
   // Allow some time for the animation to play out.
   this.setTimer(this.reset.bind(this), 500);
 };