support animated GIF

ui/file_manager/gallery/js/image_editor/image_adjust.js

Index: ui/file_manager/gallery/js/image_editor/image_adjust.js
diff --git a/ui/file_manager/gallery/js/image_editor/image_adjust.js b/ui/file_manager/gallery/js/image_editor/image_adjust.js
index 8c1b1c6953eca83a108261252b4625178898d19f..50a82f1b2171f5585a055d2a17d5e125c9657133 100644
--- a/ui/file_manager/gallery/js/image_editor/image_adjust.js
+++ b/ui/file_manager/gallery/js/image_editor/image_adjust.js
@@ -132,9 +132,12 @@ ImageEditor.Mode.Adjust.prototype.updatePreviewImage_ = function(options) {
       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;