Gallery: Fix a beginning position gap of cropping.

ui/file_manager/gallery/js/image_editor/image_transform.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';
 
 /**
  * Crop mode.
  *
  * @extends {ImageEditor.Mode}
@@ skipping 505 matching lines @@
     var maxY = clipRect.top + clipRect.height;
 
     // Returns a handler.
     return function(newScreenX, newScreenY, shiftKey) {
       var newX = this.viewport_.screenToImageX(newScreenX);
       var newY = this.viewport_.screenToImageY(newScreenY);
 
       // Check new crop.
       if (this.dragMode_.newcrop) {
         this.dragMode_.newcrop = false;
-        this.bounds_.left = this.bounds_.right = newX;
-        this.bounds_.top = this.bounds_.bottom = newY;
+        this.bounds_.left = this.bounds_.right = initialX;
+        this.bounds_.top = this.bounds_.bottom = initialY;
         mouseBiasX = 0;
         mouseBiasY = 0;
       }
 
       // Update X coordinate.
       if (this.dragMode_.xSide !== DraggableRect.NONE) {
         this.bounds_[this.dragMode_.xSide] =
             ImageUtil.clamp(clipRect.left, newX + mouseBiasX, maxX);
         if (this.bounds_.left > this.bounds_.right) {
           var left = this.bounds_.left;
@@ skipping 125 matching lines @@
       break;
     case 'bottom':
       this.bounds_.bottom = this.bounds_.top + newHeight;
       break;
     case 'none':
       this.bounds_.top = middle - newHeight / 2;
       this.bounds_.bottom = middle + newHeight / 2;
       break;
   }
 };