The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/103ed273b119a6af8a8c4c63b32573c2e2c7896b

commit 103ed273b119a6af8a8c4c63b32573c2e2c7896b
Author: Bill Orr <billorr@chromium.org>
Date: Wed Feb 14 21:23:05 2018

Enable Oculus devices behind a runtime flag

This change moves the Oculus device to be behind a runtime flag, rather
than a build flag.  It will only be enabled if is_chrome_branding,
is_win, and src_internal is available.

The means that developers testing with Oculus support should still build
locally with enable_oculus_vr gn arg if they aren't building with chrome
branding.

Public bots (CQ) will not build this, but perftests/fyi will.

BUG= 812050 

Change-Id: I7b99d98b53adf8878c0523e2eafe4ab422936ebe
Reviewed-on: https://chromium-review.googlesource.com/917644
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536817}
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/DEPS
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/chrome/browser/about_flags.cc
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/chrome/browser/vr/service/vr_device_manager.cc
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/chrome/common/chrome_features.cc
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/chrome/common/chrome_features.h
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/device/vr/features/features.gni
[modify] https://crrev.com/103ed273b119a6af8a8c4c63b32573c2e2c7896b/tools/metrics/histograms/enums.xml