Media Remoting: Add browser tests.

chrome/test/data/extensions/api_test/media_remoting/test_init.js

+// Copyright 2017 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';
+
+let mrTest = {};
+
+mrTest.StartMediaRouter = function() {
+  return new Promise((resolve, reject) => {
+    chrome.mojoPrivate.requireAsync('media_router_bindings')
+      .then(mediaRouter => {
+          this.mediaRouter_ = mediaRouter;
+          mediaRouter.start().then(instanceId => {
+            resolve({'mrService': mediaRouter, 'mrInstanceId': instanceId});
+          });
+      });
+    });
+};
+
+window.addEventListener('load', () => {
+  if (document.fullscreenEnabled) {
+    document.onfullscreenchange = () => {
+      if (document.fullscreenElement) {
+        chrome.test.sendMessage('entered_fullscreen');
+        let video = document.getElementById("video");
+        video.play();
+      } else {
+        chrome.test.sendMessage('exited_fullscreen');
+      }
+    };
+  } else if (document.webkitFullscreenEnabled) {
+    document.onwebkitfullscreenchange = () => {
+      if (document.webkitFullscreenElement) {
+        chrome.test.sendMessage('entered_fullscreen');
+        let video = document.getElementById("video");
+        video.play();
+      } else {
+        chrome.test.sendMessage('exited_fullscreen');
+      }
+    };
+  } else {
+    chrome.test.assertTrue(!"HTML5 Fullscreen API missing");
+  }
+
+  // Toggle fullscreen.
+  document.body.onclick = () => {
+    if (document.fullscreenElement || document.webkitFullscreenElement) {
+      if (document.exitFullscreen)
+        document.exitFullscreen();
+      else if (document.webkitExitFullscreen)
+        document.webkitExitFullscreen();
+      else
+        chrome.test.assertTrue(!"HTML5 Fullscreen API missing");
+    } else {
+      let video = document.getElementById("video");
+      if (video.requestFullscreen)
+        video.requestFullscreen();
+      else if (video.webkitRequestFullscreen)
+        video.webkitRequestFullscreen();
+      else
+        chrome.test.assertTrue(!"HTML5 Fullscreen API missing");
+    }
+  };
+});