Adding David as owner for further investigation

This appears to be related to spin box controls, see also  bug 793113 
JAWS traditionally works well with these, but on this particular site we need a more technical evaluation of the issue.

Assigning to Nektarios per his direction.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a592d0fa16a10907e831fe30076cba31fb848d25

commit a592d0fa16a10907e831fe30076cba31fb848d25
Author: Nektarios Paisios <nektar@chromium.org>
Date: Thu Dec 14 21:38:35 2017

Exposed the aria-valuenow attribute for ARIA-based spin buttons

1. Stopped using the value attribute to hold the inner text of spin buttons and other range controls because this could result in showing the inner text as the control's value which, depending on the control's author, could be totally meaningless. For spin buttons, now the value attribute only holds the contents of aria-valuetext if present.
2. Took the opportunity to write some more tests and clean up some of our Blink code.
R=dmazzoni@chromium.org, aleventhal@chromium.org

Also: 
Bug:  792056 
Change-Id: Ib4eb98c2c1a351f40e2ac144b1967142040f0675
Tested: manually with dropdowns on kayak.com, browser tests, sample HTML snippet of an ARIA spin button
Reviewed-on: https://chromium-review.googlesource.com/823136
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524190}
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/aria/aria-readonly-expected-android.txt
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/aria/aria-spinbutton-expected-android.txt
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/aria/aria-spinbutton-expected-mac.txt
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/aria/aria-spinbutton-expected-win.txt
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/aria/aria-spinbutton.html
[add] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/html/input-number-expected-android.txt
[add] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/html/input-number-expected-blink.txt
[add] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/html/input-number-expected-mac.txt
[add] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/html/input-number-expected-win.txt
[add] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/content/test/data/accessibility/html/input-number.html
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
[modify] https://crrev.com/a592d0fa16a10907e831fe30076cba31fb848d25/ui/accessibility/platform/ax_platform_node_win.cc