The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a4cf0fdb7983a169b84478abac507700d4ae5621

commit a4cf0fdb7983a169b84478abac507700d4ae5621
Author: Klaus Weidner <klausw@chromium.org>
Date: Tue Aug 08 20:16:37 2017

Add webvr-vsync-align feature flag

The VSync-aligned timing introduced by r47449 (crrev.com/513662) is
unhelpful for benchmarking, and external developers have requested a
way to turn this off for comparison purposes.

BUG= 750375 
R=mthiesse@chromium.org, nick@chromium.org

Change-Id: I012492c3fca922067dccfb046d6f695edfe0573f
Reviewed-on: https://chromium-review.googlesource.com/592311
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Nick Carter <nick@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492741}
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/chrome/browser/about_flags.cc
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/chrome/browser/android/vr_shell/vr_shell_gl.cc
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/chrome/browser/android/vr_shell/vr_shell_gl.h
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/content/public/common/content_features.cc
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/content/public/common/content_features.h
[modify] https://crrev.com/a4cf0fdb7983a169b84478abac507700d4ae5621/tools/metrics/histograms/enums.xml

This is included in today's canary 62.0.3180.0. Adjusting milestone to M62 since I think there's no current plans to cherrypick this to M61.