Chrome Version: 66.0.3328.0 (Official Build) Revision 1629a284e7c7c2ea5e562d9f242a84992cab5ed7-refs/heads/master@{#530801}
OS: Windows(10 Touch device)

What steps will reproduce the problem?
(1) Launch chrome, open NTP and tap/touch in omnibox
(2) Observe context menu

Actual: Context menu seems misplaced after opening it via using touch.

Expected: Context menu should not misplaced after opening it via using touch.

This is a touch specific regression issue, broken in 'M64', below is bisect info:

Good Build: 64.0.3256.0
Bad Build: 64.0.3257.0

You are probably looking for a change made after 513360 (known good), but no later than 513361 (first known bad).

CHANGELOG URL:
The script might not always return single CL as suspect as some perf builds might get missing due to failure.
https://chromium.googlesource.com/chromium/src/+lo/a28eb737c4c9424d7656ada19b688af854777968..1eca7aba022c190ea02e34dbd4ae52a8f5f88bbc

Suspect:https://chromium.googlesource.com/chromium/src/+/1eca7aba022c190ea02e34dbd4ae52a8f5f88bbc

Note: Issue is not seen on Windows(7,8), Liunx(14.04 LTS) and Mac(10.12.6,10.13.1,10.13.3) and also using click.
 

Deleted: Actual_Touch.mp4 682 KB

	Actual_Touch.mp4 682 KB View Download

Deleted: Expected_touch.mp4 1.3 MB

	Expected_touch.mp4 1.3 MB View Download