Add tests against pressing tab when a view controller is presented

ios/chrome/browser/ui/history/history_ui_egtest.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <EarlGrey/EarlGrey.h>
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 480 matching lines @@
 - (void)testAccessibilityOnHistory {
   [self openHistoryPanel];
   chrome_test_util::VerifyAccessibilityForCurrentScreen();
   // Close history.
   [[EarlGrey
       selectElementWithMatcher:chrome_test_util::ButtonWithAccessibilityLabelId(
                                    IDS_IOS_NAVIGATION_BAR_DONE_BUTTON)]
       performAction:grey_tap()];
 }
 
+// Tests that hitting the tab key doesn't trigger the omnibox in the background.
+// Testing against regressions of the fix for crbug.com/676993.
+- (void)testTabKeyIsANoOp {
+  TODO
+}
+
 #pragma mark Helper Methods
 
 - (void)loadTestURLs {
   [ChromeEarlGrey loadURL:_URL1];
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kResponse1)]
       assertWithMatcher:grey_notNil()];
 
   [ChromeEarlGrey loadURL:_URL2];
   [[EarlGrey selectElementWithMatcher:WebViewContainingText(kResponse2)]
       assertWithMatcher:grey_notNil()];
@@ skipping 26 matching lines @@
 - (void)resetBrowsingDataPrefs {
   PrefService* prefs = chrome_test_util::GetOriginalBrowserState()->GetPrefs();
   prefs->ClearPref(browsing_data::prefs::kDeleteBrowsingHistory);
   prefs->ClearPref(browsing_data::prefs::kDeleteCookies);
   prefs->ClearPref(browsing_data::prefs::kDeleteCache);
   prefs->ClearPref(browsing_data::prefs::kDeletePasswords);
   prefs->ClearPref(browsing_data::prefs::kDeleteFormData);
 }
 
 @end