Mark testScrollPositionRestoring as FLAKY.

ios/web/shell/test/page_state_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 <CoreGraphics/CoreGraphics.h>
 #import <EarlGrey/EarlGrey.h>
 #import <Foundation/Foundation.h>
 #import <XCTest/XCTest.h>
 
 #include "base/ios/ios_util.h"
@@ skipping 48 matching lines @@
 using web::test::HttpServer;
 
 // Page state test cases for the web shell.
 @interface PageStateTestCase : WebShellTestCase
 @end
 
 @implementation PageStateTestCase
 
 // Tests that page scroll position of a page is restored upon returning to the
 // page via the back/forward buttons.
-- (void)testScrollPositionRestoring {
+// TODO(crbug.com/702410): This test flakily fails when it scrolls too far down
+// the page.
+- (void)FLAKY_testScrollPositionRestoring {
   web::test::SetUpFileBasedHttpServer();
 
   // Load first URL which is a long page.
   [ShellEarlGrey loadURL:HttpServer::MakeUrl(kLongPage1)];
 
   // Scroll the first page and verify the offset.
   [[EarlGrey selectElementWithMatcher:web::WebViewScrollView()]
       performAction:grey_scrollInDirection(kGREYDirectionDown, kOffset1)];
   [[EarlGrey selectElementWithMatcher:web::WebViewScrollView()]
       assertWithMatcher:grey_scrollViewContentOffset(CGPointMake(0, kOffset1))];
@@ skipping 12 matching lines @@
       performAction:grey_tap()];
   WaitForOffset(kOffset1);
 
   // Go forward and verify that the second page offset has been restored.
   [[EarlGrey selectElementWithMatcher:web::ForwardButton()]
       performAction:grey_tap()];
   WaitForOffset(kOffset2);
 }
 
 @end