Add browser test to the sharing dialog feature 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 07005a3d7d85d155382ded3981e8209e0e68a3d7..1dac4bd4bf51e5e83393175717aa048236433182 100644
--- a/chrome/browser/resources/file_manager/js/test_util.js
+++ b/chrome/browser/resources/file_manager/js/test_util.js
@@ -221,18 +221,20 @@ test.util.async.waitForWindowGeometry = function(
  * @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 {opt_boolean=} opt_inverse True if the function should return if the
+ *    element disappears, instead of appearing.
  * @param {function(Object)} callback Callback with a hash array of attributes
  *     and contents as text.
  */
 test.util.async.waitForElement = function(
-    contentWindow, targetQuery, iframeQuery, callback) {
+    contentWindow, targetQuery, iframeQuery, opt_inverse, callback) {
   test.util.repeatUntilTrue_(function() {
     var doc = test.util.sync.getDocument_(contentWindow, iframeQuery);
     if (!doc)
       return false;
     var element = doc.querySelector(targetQuery);
     if (!element)
-      return false;
+      return opt_inverse ? true : false;
     var attributes = {};
     for (var i = 0; i < element.attributes.length; i++) {
       attributes[element.attributes[i].nodeName] =
@@ -240,7 +242,7 @@ test.util.async.waitForElement = function(
     }
     var text = element.textContent;
     callback({attributes: attributes, text: text});
-    return true;
+    return opt_inverse ? false : true;
   });
 };
 
@@ -350,23 +352,28 @@ test.util.async.waitAndAcceptDialog = function(contentWindow, callback) {
 };
 
 /**
- * Fakes pressing the down arrow until the given |filename| is selected.
+ * Fakes pressing the down arrow until the given |filename| is selected. Zero
+ * timer is used to allow to handle the selection events in Files.app, before
+ * returning the result.
  *
  * @param {Window} contentWindow Window to be tested.
  * @param {string} filename Name of the file to be selected.
- * @return {boolean} True if file got selected, false otherwise.
+ * @param {function(boolean)} callback Completion callback with true for success
+ *     and false for a failure.
  */
-test.util.sync.selectFile = function(contentWindow, filename) {
+test.util.async.selectFile = function(contentWindow, filename, callback) {
   var table = contentWindow.document.querySelector('#detail-table');
   var rows = table.querySelectorAll('li');
   for (var index = 0; index < rows.length; ++index) {
     test.util.sync.fakeKeyDown(contentWindow, '#file-list', 'Down', false);
     var selection = test.util.sync.getSelectedFiles(contentWindow);
-    if (selection.length === 1 && selection[0] === filename)
-      return true;
+    if (selection.length === 1 && selection[0] === filename) {
+      setTimeout(callback.bind(null, true), 0);
+      return;
+    }
   }
   console.error('Failed to select file "' + filename + '"');
-  return false;
+  setTimeout(callback.bind(null, false), 0);
 };
 
 /**
@@ -441,6 +448,21 @@ test.util.async.waitForFiles = function(
 };
 
 /**
+ * Executes Javascript code on a webview and returns the result.
+ *
+ * @param {Window} contentWindow Window to be tested.
+ * @param {string} webViewQuery Selector for the web view.
+ * @param {string} code Javascript code to be executed within the web view.
+ * @param {function(*)} callback Callback function with results returned by the
+ *     script.
+ */
+test.util.async.executeScriptInWebView = function(
+    contentWindow, webViewQuery, code, callback) {
+  var webView = contentWindow.document.querySelector(webViewQuery);
+  webView.executeScript({code: code}, callback);
+};
+
+/**
  * Sends an event to the element specified by |targetQuery|.
  *
  * @param {Window} contentWindow Window to be tested.
@@ -663,6 +685,9 @@ test.util.registerRemoteTestUtils = function() {
       console.error('The testing extension must be white-listed.');
       return false;
     }
+    // Set a global flag that we are in tests, so other components are aware
+    // of it.
+    window.IN_TEST = true;
     // Check the function name.
     if (!request.func || request.func[request.func.length - 1] == '_') {
       request.func = '';