Mark StackViewTestCase.testCloseAllTabs as flaky on simulator

ios/chrome/browser/ui/stack_view/stack_view_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 <XCTest/XCTest.h>
 
 #include "base/ios/block_types.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #import "base/test/ios/wait_util.h"
@@ skipping 169 matching lines @@
   [[EarlGrey selectElementWithMatcher:grey_accessibilityID(identifier)]
       performAction:grey_tap()];
   // Verify that the CardView and its associated Tab were removed.
   [[EarlGrey selectElementWithMatcher:ViewMatchingView(cardView)]
       assertWithMatcher:grey_notVisible()];
   GREYAssertEqual(chrome_test_util::GetMainTabCount(), 0,
                   @"All Tabs should be closed.");
 }
 
 // Tests closing all Tabs in the stack view.
-- (void)testCloseAllTabs {
+// TODO(crbug.com/693517): Re-enable this test on simulator.
+#if TARGET_IPHONE_SIMULATOR
+#define MAYBE_testCloseAllTabs FLAKY_testCloseAllTabs
+#else
+#define MAYBE_testCloseAllTabs testCloseAllTabs
+#endif
+- (void)MAYBE_testCloseAllTabs {
   // The StackViewController is only used on iPhones.
   if (IsIPadIdiom())
     EARL_GREY_TEST_SKIPPED(@"Stack view is not used on iPads.");
   // Open an incognito Tab.
   OpenNewIncognitoTabUsingStackView();
   GREYAssertEqual(chrome_test_util::GetIncognitoTabCount(), 1,
                   @"Incognito Tab was not opened.");
   // Open two additional Tabs.
   const NSUInteger kAdditionalTabCount = 2;
   for (NSUInteger i = 0; i < kAdditionalTabCount; ++i)
@@ skipping 43 matching lines @@
       chrome_test_util::GetStackViewController();
   GREYAssert([stackViewController isCurrentSetIncognito],
              @"Incognito deck not selected.");
   // Switch back to the main CardSet and verify that is selected.
   ShowDeckWithType(DeckType::NORMAL);
   GREYAssert(![stackViewController isCurrentSetIncognito],
              @"Normal deck not selected.");
 }
 
 @end