I'm not sure who the best person is to assign to, so the two of you can probably figure out the best person?

The first CL lists the revisions I looked between, here are the hashes:
e685bb01d1ed [Android FRE] Make parameters of FirstRunFlowSequencer#markFlowAsCompleted() clearer
3b0c080b0bb2 Reland "Media Controls: Load CSS directly in Blink"
5b2b5038c423 [Android] Record UMA action when GMS error dialog is accepted
8db59b970550 Fix favicon in case of same document navigation.
cd652c6677a9 Jumbo for blink/platform/scheduler and its unit tests (-3.5 CPU minutes)
ada41c462c0d Display image metadata for more formats than just JPEG and ICO.
57f7ae792d99 transition-end-event-multiple-03.html is flaky
9aee02a81a5c Update V8 to version 6.3.249.
23d7fb4389c9 Add a test that opens quick view, closes it, and opens it again on a folder.
33d44ee3dd44 cc: Disable edge anti-aliasing for the UI
fde0d11b0a99 BlinkGC: Document rules for non newable classes
a528bfe58a1a V4L2SVDA: ensure all PictureReady are sent while resolution change
f6f4d6734cab Use URL formatter in the context title in notification.
cc1ab7013fef S13nServiceWorker: Add a test for large scripts in ServiceWorkerScriptURLLoader
364b4e7c096e Make SnapStrictness an enum class.
22be5ece562b Don't try to show layout test results inside testing/xvfb.py
21114a5b119d Files App: Truncate 'Add new service' text


Again, it's flake so it is possible it started earlier, and we got "lucky" on a few runs. Also, if nothing looks to have contributed, we can look to see if any simulators or devices were recently updates.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/35f0d57610051b8ebadc379a0301ae1234826e2c

commit 35f0d57610051b8ebadc379a0301ae1234826e2c
Author: Mike Baxley <baxley@chromium.org>
Date: Thu Oct 05 21:24:23 2017

Mark redirect navigation EarlGrey tests as flaky.

testRedirectWindow and testRedirectRefresh are very falky on iOS 11
iPads.

TBR: eugenebut
Bug:  772128 
Change-Id: Icacf5d4c8f0cad3693d161ad31ade70ecbd960c7
Reviewed-on: https://chromium-review.googlesource.com/703469
Reviewed-by: Mike Baxley <baxley@chromium.org>
Commit-Queue: Mike Baxley <baxley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506864}
[modify] https://crrev.com/35f0d57610051b8ebadc379a0301ae1234826e2c/ios/chrome/browser/web/navigation_egtest.mm

I don't think there was a breakage. I'm surprised that these tests ever worked given the code which does not wait for navigation completion:

  [ChromeEarlGrey loadURL:indexURL];
  TapWebViewElementWithId(redirectLabel);
  [[EarlGrey selectElementWithMatcher:chrome_test_util::OmniboxText(
                                          destinationURL.GetContent())]
      assertWithMatcher:grey_notNil()];

Eugene, so what is your plan here?

The plan is to fix the tests. Application is fine, so we don't need to block beta release with this bug.

Have you made a progress fixing the test Eugene?

Tests are only disabled on iPad and should not block beta release.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d070ceb3c987d77ec9abb69ddf73a42aea07539e

commit d070ceb3c987d77ec9abb69ddf73a42aea07539e
Author: Eugene But <eugenebut@google.com>
Date: Wed Oct 18 22:58:09 2017

Fixed -[NavigationTestCase verifyBackAndForwardAfterRedirect:].

Added code which waits for page loads after navigations.
Disabled tests will be enabled in a separate CL.

Also improved code formatting were OmniboxText is used.

Bug:  772128 
Change-Id: I93880d1053e37e012240c7013d3e642b17acf38e
Reviewed-on: https://chromium-review.googlesource.com/726241
Reviewed-by: Mike Baxley <baxley@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509909}
[modify] https://crrev.com/d070ceb3c987d77ec9abb69ddf73a42aea07539e/ios/chrome/browser/web/navigation_egtest.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/145b9447374ef27ef091cac335b3043e44fdda55

commit 145b9447374ef27ef091cac335b3043e44fdda55
Author: Eugene But <eugenebut@google.com>
Date: Thu Nov 09 23:43:48 2017

Enabled testRedirectWindow and testRedirectRefresh EG tests.

Tests were actually flaky and the fix was landed in crrev.com/c/726241

Bug:  772128 
Change-Id: I371183a089cba7b98937cb198eb4bea4238ce824
Reviewed-on: https://chromium-review.googlesource.com/761056
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515348}
[modify] https://crrev.com/145b9447374ef27ef091cac335b3043e44fdda55/ios/chrome/browser/web/navigation_egtest.mm