The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/41087271016f15bcb82356f9ab505efc36af4153

commit 41087271016f15bcb82356f9ab505efc36af4153
Author: eugenebut <eugenebut@chromium.org>
Date: Wed Nov 30 17:01:15 2016

[ios] Improved GetIndexForOffset performance to large offsets.

BUG= 668318 

Review-Url: https://codereview.chromium.org/2526093002
Cr-Commit-Position: refs/heads/master@{#435298}

[modify] https://crrev.com/41087271016f15bcb82356f9ab505efc36af4153/ios/web/navigation/navigation_manager_impl.mm
[modify] https://crrev.com/41087271016f15bcb82356f9ab505efc36af4153/ios/web/navigation/navigation_manager_impl_unittest.mm

Your change meets the bar and is auto-approved for M56 (branch: 2924)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d03344d142ac9fb00f061e5ee823fb6b57794f4e

commit d03344d142ac9fb00f061e5ee823fb6b57794f4e
Author: eugenebut <eugenebut@chromium.org>
Date: Fri Dec 02 22:35:44 2016

[ios] Improved GetIndexForOffset performance to large offsets.

The difference from trunk CL is allowing integer overflows, which is not
a big issue in practice.

BUG= 668318 
Trunk CL: https://codereview.chromium.org/2526093002/
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2540373003
Cr-Commit-Position: refs/branch-heads/2924@{#306}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/d03344d142ac9fb00f061e5ee823fb6b57794f4e/ios/web/navigation/crw_session_controller.mm