Convert grid_view.js to use async-await.

Bug: 909056
Change-Id: I70453c9a11b2d2cab1fa0355647b333508ba700c
Reviewed-on: https://chromium-review.googlesource.com/c/1351982
Commit-Queue: Sam McNally <sammc@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612480}

ui/file_manager/integration_tests/file_manager/grid_view.js

@@ -14,57 +14,45 @@
  * @return {Promise} Promise to be fulfilled or rejected depending on the test
  *     result.
  */
-function showGridView(rootPath, expectedSet) {
-  var caller = getCaller();
-  var expectedLabels = expectedSet.map(function(entryInfo) {
-    return entryInfo.nameText;
-  }).sort();
-  var setupPromise = setupAndWaitUntilReady(null, rootPath);
-  return setupPromise.then(function(results) {
-    var windowId = results.windowId;
+async function showGridView(rootPath, expectedSet) {
+  const caller = getCaller();
+  const expectedLabels =
+      expectedSet.map((entryInfo) => entryInfo.nameText).sort();
+
+  // Open Files app on |rootPath|.
+  const {appId} = await setupAndWaitUntilReady(null, rootPath);
+
   // Click the grid view button.
-    var clickedPromise = remoteCall.waitForElement(windowId,
-                                                   '#view-button').
-        then(function() {
-          return remoteCall.callRemoteTestUtil(
-              'fakeEvent', windowId, ['#view-button', 'click']);
-        });
+  await remoteCall.waitForElement(appId, '#view-button');
+  await remoteCall.callRemoteTestUtil(
+      'fakeEvent', appId, ['#view-button', 'click']);
 
   // Compare the grid labels of the entries.
-    return clickedPromise.then(function() {
-      return repeatUntil(function() {
-        var labelsPromise = remoteCall.callRemoteTestUtil(
-            'queryAllElements',
-            windowId,
+  await repeatUntil(async () => {
+    const labels = await remoteCall.callRemoteTestUtil(
+        'queryAllElements', appId,
         ['grid:not([hidden]) .thumbnail-item .entry-name']);
-        return labelsPromise.then(function(labels) {
-          var actualLabels = labels.map(function(label) {
-            return label.text;
-          }).sort();
-          if (chrome.test.checkDeepEq(expectedLabels, actualLabels))
+    const actualLabels = labels.map((label) => label.text).sort();
+
+    if (chrome.test.checkDeepEq(expectedLabels, actualLabels)) {
       return true;
+    }
     return pending(
-              caller,
-              'Failed to compare the grid lables, expected: %j, actual %j.',
+        caller, 'Failed to compare the grid lables, expected: %j, actual %j.',
         expectedLabels, actualLabels);
   });
-      });
-    });
-  });
 }
 
 /**
  * Tests to show grid view on a local directory.
  */
 testcase.showGridViewDownloads = function() {
-  testPromise(showGridView(
-      RootPath.DOWNLOADS, BASIC_LOCAL_ENTRY_SET));
+  return showGridView(RootPath.DOWNLOADS, BASIC_LOCAL_ENTRY_SET);
 };
 
 /**
  * Tests to show grid view on a drive directory.
  */
 testcase.showGridViewDrive = function() {
-  testPromise(showGridView(
-      RootPath.DRIVE, BASIC_DRIVE_ENTRY_SET));
+  return showGridView(RootPath.DRIVE, BASIC_DRIVE_ENTRY_SET);
 };