The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/157602278ef0f09beffd09f2491807fbb19c763e

commit 157602278ef0f09beffd09f2491807fbb19c763e
Author: mustaq <mustaq@chromium.org>
Date: Wed Aug 10 18:49:29 2016

Added PointerEvent.hasPointerCapture API.

BUG= 634512 

Review-Url: https://codereview.chromium.org/2220043002
Cr-Commit-Position: refs/heads/master@{#411106}

[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/LayoutTests/fast/events/pointerevents/mouse-pointer-capture.html
[add] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/LayoutTests/fast/events/pointerevents/mouse-pointer-haspointercapture.html
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/dom/Element.cpp
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/dom/Element.h
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/dom/Element.idl
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/input/EventHandler.cpp
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/input/EventHandler.h
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/input/PointerEventManager.cpp
[modify] https://crrev.com/157602278ef0f09beffd09f2491807fbb19c763e/third_party/WebKit/Source/core/input/PointerEventManager.h

mustaq,

Which version of Chrome are you aiming for?

M54 is fine, this is part PointerEvent v2.