Files.app: Fix selection on creating new folder

chrome/test/data/extensions/api_test/file_manager_browsertest/background.js

Index: chrome/test/data/extensions/api_test/file_manager_browsertest/background.js
diff --git a/chrome/test/data/extensions/api_test/file_manager_browsertest/background.js b/chrome/test/data/extensions/api_test/file_manager_browsertest/background.js
index 0ac4292cbd709a083592963e27dde606de3de39e..12ef690a6008d9eec649b329fadbb3433a3147e9 100644
--- a/chrome/test/data/extensions/api_test/file_manager_browsertest/background.js
+++ b/chrome/test/data/extensions/api_test/file_manager_browsertest/background.js
@@ -319,6 +319,21 @@ function waitUntilTaskExecutes(windowId, taskId) {
 }
 
 /**
+ * Adds check of chrome.test to the end of the given promise.
+ * @param {Promise} promise Promise.
+ */
+function testPromise(promise) {
+  promise.then(function() {
+    return new Promise(checkIfNoErrorsOccured);
+  }).then(chrome.test.callbackPass(function() {
+    // The callbacPass is necessary to avoid prematurely finishing tests.
+    // Don't put chrome.test.succeed() here to avoid doubled success log.
+  }), function(error) {
+    chrome.test.fail(error.stack || error);
+  });
+};
+
+/**
  * Sends a fake key down event.
  * @param {string} windowId Window ID.
  * @param {string} query Query for the target element.