Add tests for the video player in Files.app.

chrome/browser/resources/file_manager/js/test_util.js

Index: chrome/browser/resources/file_manager/js/test_util.js
diff --git a/chrome/browser/resources/file_manager/js/test_util.js b/chrome/browser/resources/file_manager/js/test_util.js
index c5c7c450b269491dcdda9e932e26d700cb8df56f..3bf80fad5399b63a2abf090c1ed0022304490ad4 100644
--- a/chrome/browser/resources/file_manager/js/test_util.js
+++ b/chrome/browser/resources/file_manager/js/test_util.js
@@ -49,6 +49,28 @@ test.util.openMainWindow = function(path, callback) {
 };
 
 /**
+ * Waits for a window with the specified App ID prefix. Eg. `files` will match
+ * windows such as files#0, files#1, etc.
+ *
+ * @param {string} appIdPrefix ID prefix of the requested window.
+ * @param {function(string)} callback Completion callback with the new window's
+ *     App ID.
+ */
+test.util.waitForWindow = function(appIdPrefix, callback) {
+  var appId;
+  function helper() {
+    for (var appId in appWindows) {
+      if (appId.indexOf(appIdPrefix) == 0) {
+        callback(appId);
+        return;
+      }
+    }
+    window.setTimeout(helper, 50);
+  }
+  helper();
+};
+
+/**
  * Gets a document in the Files.app's window, including iframes.
  *
  * @param {Window} contentWindow Window to be used.
@@ -135,12 +157,34 @@ test.util.getFileList = function(contentWindow) {
 };
 
 /**
+ * Waits until the window is set to the specified dimensions.
+ *
+ * @param {Window} contentWindow Window to be tested.
+ * @param {number} width Requested width.
+ * @param {number} height Requested height.
+ * @param {function(Object)} callback Success callback with the dimensions.
+ */
+test.util.waitForWindowGeometry = function(
+    contentWindow, width, height, callback) {
+  function helper() {
+    if (contentWindow.innerWidth == width &&
+        contentWindow.innerHeight == height) {
+       callback({width: width, height: height});
+       return;
+    }
+    window.setTimeout(helper, 50);
+  }
+  helper();
+};
+
+/**
  * Waits for an element and returns it as an array of it's attributes.
  *
  * @param {Window} contentWindow Window to be tested.
  * @param {string} targetQuery Query to specify the element.
  * @param {?string} iframeQuery Iframe selector or null if no iframe.
- * @param {function(Object)} callback Callback with a hash array of attributes.
+ * @param {function(Object)} callback Callback with a hash array of attributes
+ *     and contents as text.
  */
 test.util.waitForElement = function(
     contentWindow, targetQuery, iframeQuery, callback) {
@@ -154,7 +198,8 @@ test.util.waitForElement = function(
           attributes[element.attributes[i].nodeName] =
               element.attributes[i].nodeValue;
         }
-        callback(attributes);
+        var text = element.textContent;
+        callback({attributes: attributes, text: text});
         return;
       }
     }
@@ -483,6 +528,9 @@ test.util.registerRemoteTestUtils = function() {
         case 'openMainWindow':
           test.util.openMainWindow(request.args[0], sendResponse);
           return true;
+        case 'waitForWindow':
+          test.util.waitForWindow(request.args[0], sendResponse);
+          return true;
         case 'getErrorCount':
           sendResponse(test.util.getErrorCount());
           return true;
@@ -502,6 +550,10 @@ test.util.registerRemoteTestUtils = function() {
         case 'getFileList':
           sendResponse(test.util.getFileList(contentWindow));
           return false;
+        case 'waitForWindowGeometry':
+          test.util.waitForWindowGeometry(
+              contentWindow, request.args[0], request.args[1], sendResponse);
+          return true;
         case 'waitForElement':
           test.util.waitForElement(
               contentWindow, request.args[0], request.args[1], sendResponse);