Added browser tests to test the BudgetAPI. Also added BudgetAPI to ExperimentalWebPlatformFeatures.

chrome/test/data/push_messaging/push_test.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';
 
+// The ResultQueue is a mechanism for passing messages back to the test
+// framework.
 var resultQueue = new ResultQueue();
 
 var pushSubscriptionOptions = {
   userVisibleOnly: true
 };
 
-// Sends data back to the test. This must be in response to an earlier
-// request, but it's ok to respond asynchronously. The request blocks until
-// the response is sent.
-function sendResultToTest(result) {
-  console.log('sendResultToTest: ' + result);
-  if (window.domAutomationController) {
-    domAutomationController.send('' + result);
-  }
-}
-
-function sendErrorToTest(error) {
-  sendResultToTest(error.name + ' - ' + error.message);
-}
-
-// Queue storing asynchronous results received from the Service Worker. Results
-// are sent to the test when requested.
-function ResultQueue() {
-  // Invariant: this.queue.length == 0 || this.pendingGets == 0
-  this.queue = [];
-  this.pendingGets = 0;
-}
-
-// Adds a data item to the queue. Will be sent to the test if there are
-// pendingGets.
-ResultQueue.prototype.push = function(data) {
-  if (this.pendingGets > 0) {
-    this.pendingGets--;
-    sendResultToTest(data);
-  } else {
-    this.queue.unshift(data);
-  }
-};
-
-// Called by native. Sends the next data item to the test if it is available.
-// Otherwise increments pendingGets so it will be delivered when received.
-ResultQueue.prototype.pop = function() {
-  if (this.queue.length) {
-    sendResultToTest(this.queue.pop());
-  } else {
-    this.pendingGets++;
-  }
-};
-
-// Called by native. Immediately sends the next data item to the test if it is
-// available, otherwise sends null.
-ResultQueue.prototype.popImmediately = function() {
-  sendResultToTest(this.queue.length ? this.queue.pop() : null);
-};
-
 // Waits for the given ServiceWorkerRegistration to become ready.
 // Shim for https://github.com/w3c/ServiceWorker/issues/770.
 function swRegistrationReady(reg) {
   return new Promise((resolve, reject) => {
     if (reg.active) {
       resolve();
       return;
     }
 
     if (!reg.installing && !reg.waiting) {
@@ skipping 186 matching lines @@
   }).catch(sendErrorToTest);
 }
 
 navigator.serviceWorker.addEventListener('message', function(event) {
   var message = JSON.parse(event.data);
   if (message.type == 'push')
     resultQueue.push(message.data);
   else
     sendResultToTest(message.data);
 }, false);