Marking RBB M-57 to evaluate the impact.

Mike, could you please include a failure link

Here is where it is failing:
../../ios/web/shell/test/page_state_egtest.mm:84: error: -[PageStateTestCase testScrollPositionRestoring] : Assertion 'assertWithMatcher:(kindOfClass("UIScrollView") && contentOffset)' failed.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c654fbbf22e44c70cefdf01e9bdfffaabf837996

commit c654fbbf22e44c70cefdf01e9bdfffaabf837996
Author: baxley <baxley@chromium.org>
Date: Fri Dec 02 17:11:04 2016

Disable testScrollPositionRestoring on iOS 9.

This test is flaky on iOS 9, but works on iOS 10.

BUG= 670700 

Review-Url: https://codereview.chromium.org/2551503002
Cr-Commit-Position: refs/heads/master@{#435960}

[modify] https://crrev.com/c654fbbf22e44c70cefdf01e9bdfffaabf837996/ios/web/shell/test/page_state_egtest.mm

Please update this bug including its status if you have started working on it.

Still disabled on iOS 9 with "TODO( crbug.com/670700 ): Re-enable this test.". Please close if I reopened by mistake.

Thanks for looking out.  I accidentally closed this bug instead of the other bug I was working on on Friday.  Should be finished with this one later today :)

https://codereview.chromium.org/2637113004/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c91d38d7912b0076bce36e6ad318c197cd6d5a0a

commit c91d38d7912b0076bce36e6ad318c197cd6d5a0a
Author: kkhorimoto <kkhorimoto@chromium.org>
Date: Wed Jan 18 19:08:52 2017

Wait for scroll offset in testScrollPositionRestoring.

This ensures that the content offset is applied before attempting
to verify using the contentOffset() matcher.

BUG= 670700 

Review-Url: https://codereview.chromium.org/2637113004
Cr-Commit-Position: refs/heads/master@{#444433}

[modify] https://crrev.com/c91d38d7912b0076bce36e6ad318c197cd6d5a0a/ios/web/shell/test/page_state_egtest.mm