Extension SW: Add tests that serve web_accessible_resources from a SW.

chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/fetch/page.js

Index: chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/fetch/page.js
diff --git a/chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/fetch/page.js b/chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/fetch/page.js
new file mode 100644
index 0000000000000000000000000000000000000000..34c3da22bfc3caea996cb24b0427199eb9c88301
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/fetch/page.js
@@ -0,0 +1,69 @@
+// Copyright 2015 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.
+
+var getTestURL = function() {
+  return chrome.runtime.getURL('./data_for_extension');
+};
+
+var workerRegisterAndClaimPromise = function() {
+  return new Promise(function(resolve, reject) {
+    // Register a ServiceWorker and expect it to control subsequent requests.
+    navigator.serviceWorker.register('sw.js').then(function(registration) {
+      return navigator.serviceWorker.ready;
+    }).then(function(registration) {
+      var channel = new MessageChannel();
+      // Wait for ServiceWorker to claim itself.
+      channel.port1.onmessage = function(e) {
+        if (e.data == 'clients claimed') {
+          resolve(registration);
+        } else {
+          reject('Claim failure: ' + e.data);
+        }
+      };
+      registration.active.postMessage('claim', [channel.port2]);
+    }).catch(function(err) {
+      reject(err);
+    });
+  });
+};
+
+var workerControlsPagePromise = function() {
+  return new Promise(function(resolve, reject) {
+    fetch(getTestURL()).then(function(response) {
+      return response.text();
+    }).then(function(text) {
+      if (text != 'SW served data') {
+        reject('Fetch() result error[2]: ' + text);
+      }
+      resolve();
+    }).catch(function(err) {
+      reject(err);
+    });
+  });
+};
+
+var test = function() {
+  var serviceWorkerRegistration;
+  // First request would not be controlled by ServiceWorker as the worker
+  // doesn't exist yet.
+  fetch(getTestURL()).then(function(response) {
+    return response.text();
+  }).then(function(text) {
+    if (text != 'original data\n') {
+      throw 'Fetch() result error[1]: ' + text;
+    }
+    return workerRegisterAndClaimPromise();
+  }).then(function(registration) {
+    serviceWorkerRegistration = registration;
+    return workerControlsPagePromise();
+  }).then(function() {
+    return serviceWorkerRegistration.unregister();
+  }).then(function() {
+    chrome.test.succeed();
+  }).catch(function(err) {
+    chrome.test.fail(err);
+  });
+};
+
+chrome.test.runTests([test]);