The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1050ce09032d5c5813cc3b4a4dc375c4e9881f78

commit 1050ce09032d5c5813cc3b4a4dc375c4e9881f78
Author: Javier Ernesto Flores Robles <javierrobles@google.com>
Date: Mon Sep 17 16:34:13 2018

Enable automatic property synthesis on iOS builds.

One-pager (maybe a bit more than 1 page):
https://docs.google.com/document/d/1Z-UBBqx1jmSsN1Uu1mUbTt_b9D36Hj1GYdYf5ISXb8o/edit?usp=sharing

Bug:  859842 
Change-Id: I9bf503215cd1d0eebeb4831cae61c2fe62ba379f
Reviewed-on: https://chromium-review.googlesource.com/1124324
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591703}
[modify] https://crrev.com/1050ce09032d5c5813cc3b4a4dc375c4e9881f78/build/config/compiler/BUILD.gn