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

chrome/browser/resources/gpu_internals/browser_bridge.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.
+
+cr.define('gpu', function() {
+  /**
+   * This class provides a 'bridge' for communicating between javascript and
+   * the browser.
+   * @constructor
+   */
+  function BrowserBridge() {
+    // If we are not running inside DOMUI, output chrome.send messages
+    // to the console to help with quick-iteration debugging.
+    if (chrome.send === undefined && console.log) {
+      chrome.send = function(messageHandler, args) {
+        console.log('chrome.send', messageHandler, args);
+      };
+    }
+
+    this.nextRequestId_ = 0;
+    this.pendingCallbacks_ = [];
+  }
+
+  BrowserBridge.prototype = {
+    __proto__: Object.prototype,
+
+    /**
+     * Sends a message to the browser with specified args. The
+     * browser will reply asynchronously via the provided callback.
+     */
+    callAsync: function(submessage, args, callback) {
+      var requestId = this.nextRequestId_;
+      this.nextRequestId_ += 1;
+      this.pendingCallbacks_[requestId] = callback;
+      if (!args) {
+        chrome.send('callAsync', [requestId.toString(), submessage]);
+      } else {
+        var allArgs = [requestId.toString(), submessage].concat(args);
+        chrome.send('callAsync', allArgs);
+      }
+    },
+
+    /**
+     * Called by gpu c++ code when client info is ready.
+     */
+    onCallAsyncReply: function(requestId, args) {
+      if (this.pendingCallbacks_[requestId] === undefined) {
+        throw new Error('requestId ' + requestId + ' is not pending');
+      }
+      var callback = this.pendingCallbacks_[requestId];
+      callback(args);
+      delete this.pendingCallbacks_[requestId];
+    }
+  };
+
+  return {
+    BrowserBridge : BrowserBridge
+  };
+});