Remove repaint callbacks from Viewport.

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.
 
 'use strict';
 
 /**
  * ImageEditor is the top level object that holds together and connects
  * everything needed for image editing.
  *
@@ skipping 11 matching lines @@
     viewport, imageView, prompt, DOMContainers, modes, displayStringFunction,
     onToolsVisibilityChanged) {
   this.rootContainer_ = DOMContainers.root;
   this.container_ = DOMContainers.image;
   this.modes_ = modes;
   this.displayStringFunction_ = displayStringFunction;
   this.onToolsVisibilityChanged_ = onToolsVisibilityChanged;
 
   ImageUtil.removeChildren(this.container_);
 
-  var document = this.container_.ownerDocument;
-
   this.viewport_ = viewport;
   this.viewport_.sizeByFrame(this.container_);
 
-  this.buffer_ = new ImageBuffer();
-  this.viewport_.addRepaintCallback(this.buffer_.draw.bind(this.buffer_));
-
   this.imageView_ = imageView;
   this.imageView_.addContentCallback(this.onContentUpdate_.bind(this));
+
+  this.buffer_ = new ImageBuffer();
   this.buffer_.addOverlay(this.imageView_);
 
   this.panControl_ = new ImageEditor.MouseControl(
       this.rootContainer_, this.container_, this.getBuffer());
-
   this.panControl_.setDoubleTapCallback(this.onDoubleTap_.bind(this));
 
   this.mainToolbar_ = new ImageEditor.Toolbar(
       DOMContainers.toolbar, displayStringFunction);
 
   this.modeToolbar_ = new ImageEditor.Toolbar(
       DOMContainers.mode, displayStringFunction,
       this.onOptionsChange.bind(this));
 
   this.prompt_ = prompt;
@@ skipping 1140 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);
 };