[QuickView] Fix comment nits in quick_view.js

Bug: 907380
Change-Id: I3d8c4d1c4457b6ee9a11d58fe23ce6402e4d6805
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994022
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730064}

ui/file_manager/integration_tests/file_manager/quick_view.js

@@ -1261,7 +1261,8 @@
   };
 
   /**
-   * Tests checking the tabbing on jpeg files in Quick View.
+   * Tests the tab-index focus order when sending tab keys when an image file is
+   * shown in Quick View.
    */
   testcase.openQuickViewTabIndexImage = async () => {
     const caller = getCaller();
@@ -1280,7 +1281,7 @@
     // Open the file in Quick View.
     await openQuickView(appId, ENTRIES.smallJpeg.nameText);
 
-    // Prepare a list of tab-index queries.
+    // Prepare a list of tab-index focus queries.
     const tabQueries = [
       {'query': ['#quick-view', '[aria-label="Back"]:focus']},
       {'query': ['#quick-view', '[aria-label="Open"]:focus']},
@@ -1288,17 +1289,17 @@
       {'query': ['#quick-view', '[aria-label="Back"]:focus']},
     ];
 
-    // Hit tab key to focus on the element.
     for (const query of tabQueries) {
+      // Make the browser dispatch a tab key event to FilesApp.
       const result = await sendTestMessage(
           {name: 'dispatchTabKey', shift: query.shift || false});
       chrome.test.assertEq(
           result, 'tabKeyDispatched', 'Tab key dispatch failure');
 
-      // Wait until we get the focus on the element
+      // Wait until we get the focus on the element.
       await remoteCall.waitForElement(appId, query.query);
 
-      // Make sure the events are handled correctly.
+      // Ensure all events have been processed before continuing.
       chrome.test.assertTrue(await remoteCall.callRemoteTestUtil(
           'requestAnimationFrame', appId, []));
     }