The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/98e8c6fbeee3d932ed3ce37dbfd8630246dfcf9c

commit 98e8c6fbeee3d932ed3ce37dbfd8630246dfcf9c
Author: Aaron Leventhal <aleventhal@chromium.org>
Date: Thu Jun 01 20:55:44 2017

Support aria-pressed="mixed" and refactor mixed state support to reuse internal checked tristate.

Includes failing tests from https://codereview.chromium.org/2707263011/ and https://codereview.chromium.org/2906083002/
Bug:  726740 , 726751 
Change-Id: I6b06018f805c4fce781843141109626bab557dcc

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I6b06018f805c4fce781843141109626bab557dcc
Reviewed-on: https://chromium-review.googlesource.com/516586
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476430}
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[add] https://crrev.com/98e8c6fbeee3d932ed3ce37dbfd8630246dfcf9c/content/test/data/accessibility/event/pressed-state-change.html
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[modify] https://crrev.com/98e8c6fbeee3d932ed3ce37dbfd8630246dfcf9c/third_party/WebKit/Source/core/dom/AccessibleNode.cpp
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[modify] https://crrev.com/98e8c6fbeee3d932ed3ce37dbfd8630246dfcf9c/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
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