The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8bb5753ba27264e389695625f3749ca1419ca124

commit 8bb5753ba27264e389695625f3749ca1419ca124
Author: Aaron Leventhal <aleventhal@chromium.org>
Date: Wed Jul 26 20:31:53 2017

Support aria-readonly on more roles

The aria-readonly property should be supported on roles that inherit from other roles with aria-readonly support.

Bug:  748500 
Change-Id: I2dd3a2d584a29168fe7f5ec596a199a822361d49
Reviewed-on: https://chromium-review.googlesource.com/584015
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489741}
[modify] https://crrev.com/8bb5753ba27264e389695625f3749ca1419ca124/content/test/data/accessibility/aria/aria-readonly-expected-android.txt
[modify] https://crrev.com/8bb5753ba27264e389695625f3749ca1419ca124/content/test/data/accessibility/aria/aria-readonly-expected-blink.txt
[modify] https://crrev.com/8bb5753ba27264e389695625f3749ca1419ca124/content/test/data/accessibility/aria/aria-readonly-expected-mac.txt
[modify] https://crrev.com/8bb5753ba27264e389695625f3749ca1419ca124/content/test/data/accessibility/aria/aria-readonly-expected-win.txt
[modify] https://crrev.com/8bb5753ba27264e389695625f3749ca1419ca124/content/test/data/accessibility/aria/aria-readonly.html
[modify] https://crrev.com/8bb5753ba27264e389695625f3749ca1419ca124/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp