The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f0fea1cfeb1babe2e04a7330ed59279d9552765d

commit f0fea1cfeb1babe2e04a7330ed59279d9552765d
Author: Aaron Leventhal <aleventhal@chromium.org>
Date: Thu Jul 26 15:59:36 2018

Update <frame> and <iframe> mappings in IA2

Expose as IA2_ROLE_INTERNAL_FRAME, and do not used STATE_SYSTEM_READONLY or FOCUSABLE.

Bug:  867015 
Change-Id: I310c3dc3fa1cede34b54d66a35c23ca4345b1ebd
Reviewed-on: https://chromium-review.googlesource.com/1148785
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578317}
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/frameset-expected-blink.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/frameset-expected-win.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/iframe-coordinates-cross-process-expected-win.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/iframe-coordinates-expected-win.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/iframe-cross-process-expected-win.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/iframe-expected-win.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/content/test/data/accessibility/html/iframe-transform-expected-win.txt
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/third_party/blink/renderer/modules/accessibility/ax_node_object.cc
[modify] https://crrev.com/f0fea1cfeb1babe2e04a7330ed59279d9552765d/ui/accessibility/platform/ax_platform_node_win.cc