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

chrome/test/data/budget_service/budget_test.js

Index: chrome/test/data/budget_service/budget_test.js
diff --git a/chrome/test/data/budget_service/budget_test.js b/chrome/test/data/budget_service/budget_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..72bd50e8019961478c2f42a431181df2ceceb316
--- /dev/null
+++ b/chrome/test/data/budget_service/budget_test.js
@@ -0,0 +1,62 @@
+// Copyright 2016 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();
+
+function registerServiceWorker() {
+  // The base dir used to resolve service_worker.js.
+  navigator.serviceWorker.register('service_worker.js', {scope: './'}).then(
+      function(swRegistration) {
+        sendResultToTest('ok - service worker registered');
+      }, sendErrorToTest);
+}
+
+// Query for the budget and return the current total.
+function documentGetBudget() {
+  navigator.budget.getBudget().then(function(budget) {
+    sendResultToTest("ok - budget returned value of " + budget[0].budgetAt);
+  }, function() {
+    sendResultToTest("failed - unable to get budget values");
+  });
+}
+
+// Request a reservation for a silent push.
+function documentReserveBudget() {
+  navigator.budget.reserve('silent-push').then(function(reserved) {
+    if (reserved)
+      sendResultToTest("ok - reserved budget");
+    else
+      sendResultToTest("failed - not able to reserve budget");
+  }, function() {
+    sendResultToTest("failed - error while trying to reserve budget");
+  });
+}
+
+function workerGetBudget() {
+  navigator.serviceWorker.controller.postMessage({command: 'workerGet'});
+}
+
+function workerReserveBudget() {
+  navigator.serviceWorker.controller.postMessage({command: 'workerReserve'});
+}
+
+function isControlled() {
+  if (navigator.serviceWorker.controller) {
+    sendResultToTest('true - is controlled');
+  } else {
+    sendResultToTest('false - is not controlled');
+  }
+}
+
+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);