Switch the about:gpu implementation from an about handler to dom_ui....

chrome/browser/resources/net_internals/view.js

 // Copyright (c) 2010 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.
 
 /**
  * Base class to represent a "view". A view is an absolutely positioned box on
  * the page.
  *
  * @constructor
  */
@@ skipping 62 matching lines @@
 
 /**
  * DivView is an implementation of View that wraps a DIV.
  *
  * @constructor
  */
 function DivView(divId) {
   View.call(this);
 
   this.node_ = document.getElementById(divId);
+  if (!this.node_)
+    throw new Error('Element ' + divId + ' not found');
 
   // Initialize the default values to those of the DIV.
   this.width_ = this.node_.offsetWidth;
   this.height_ = this.node_.offsetHeight;
   this.isVisible_ = this.node_.style.display != 'none';
 }
 
 inherits(DivView, View);
 
 DivView.prototype.setGeometry = function(left, top, width, height) {
@@ skipping 39 matching lines @@
 
 WindowView.prototype.show = function() {
   WindowView.superClass_.show.call(this, isVisible);
   this.childView_.show(isVisible);
 };
 
 WindowView.prototype.resetGeometry = function() {
   this.setGeometry(0, 0, window.innerWidth, window.innerHeight);
 };