Video Player: Add a test to open a single video file

chrome/test/data/extensions/api_test/file_manager_browsertest/video_player/test_util.js

Index: chrome/test/data/extensions/api_test/file_manager_browsertest/video_player/test_util.js
diff --git a/chrome/test/data/extensions/api_test/file_manager_browsertest/video_player/test_util.js b/chrome/test/data/extensions/api_test/file_manager_browsertest/video_player/test_util.js
new file mode 100644
index 0000000000000000000000000000000000000000..f8ccbe451bfb4ba34834a3785e71b10187088c28
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+++ b/chrome/test/data/extensions/api_test/file_manager_browsertest/video_player/test_util.js
@@ -0,0 +1,43 @@
+// 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';
+
+/**
+ * Launches the video player with the given entries.
+ *
+ * @param {string} testVolumeName Test volume name passed to the addEntries
+ *     function. Either 'drive' or 'local'.
+ * @param {VolumeManagerCommon.VolumeType} volumeType Volume type.
+ * @param {Array.<TestEntryInfo>} entries Entries to be parepared and passed to
+ *     the application.
+ * @param {Array.<TestEntryInfo>=} opt_selected Entries to be selected. Should
+ *     be a sub-set of the entries argument.
+ * @return {Promise} Promise to be fulfilled with the video player element.
+ */
+function launch(testVolumeName, volumeType, entries, opt_selected) {
+
+  var entriesPromise = addEntries([testVolumeName], entries).then(function() {
+    var selectedEntries = opt_selected || entries;
+    return getFilesUnderVolume(
+        volumeType,
+        selectedEntries.map(function(entry) { return entry.nameText; }));
+  });
+
+  var appWindow = null;
+  return entriesPromise.then(function(entries) {
+    return open(entries.map(function(entry) {
+      return {entry: entry, title: entry.name, url: entry.toURL()};
+    })).then(function() {
+      appWindow = appWindowsForTest[entries[0].name];
+    });
+  }).then(function() {
+    return Promise.all([
+      waitForElement(appWindow, '#video-player[first-video][last-video]'),
+      waitForElement(appWindow, '.play.media-button[state="playing"]'),
+    ]).then(function(args) {
+      return args[0];
+    });
+  });
+}