WebVR issue: https://github.com/w3c/webvr/issues/86

To clarify, you mean having a Chrome policy that can be used to disable WebVR support?

Feature Policy refers to https://github.com/WICG/feature-policy*, which is a mechanisms for apps/servers to control whether features are enabled, including on embedded iframes.

* See the explainer - the spec is out of date.

+1 to everything ddorwin@ said :)

FP GitHub issue: https://github.com/WICG/feature-policy/issues/49

This will hopefully be able to replace the "allowvr" iframe attribute with a more configurable policy that can be set by ancestor frames.

This Chromium issue is to implement the linkage between the feature policy code and the WebVR code, to actually deny access to the API in cases where the policy says it should be disabled.

(Sorry if that means the Component is misleading; I've put out a request for a Blink>FeaturePolicy component, but it's not there yet)

I had left iOS out of the OS list, since FeaturePolicy is a Blink-specific feature. I'm not certain that we'll be able to support iOS.

Not blocking launch; slated for V2

iclelland: We'd like to start requiring this in the next update to WebVR, which would be in M62. Is there anything on the Feature Policy side that would block this?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/36e485aae6fcb3231843941f750df0428bcb401d

commit 36e485aae6fcb3231843941f750df0428bcb401d
Author: Biao She <bshe@chromium.org>
Date: Wed Aug 30 23:52:38 2017

Add vr feature policy

This CL enables vr feature policy. So that, if you want to disable vr within
your application, you can delivering the following HTTP response header:
Feature-Policy: vr 'none'
If you want to enable vr for all frames(including cross-origin iframes),
delivering this:
Feature-Policy: vr *
If you want to enable vr just for your own origin, delivering this:
Feature-Policy: vr 'self'

To request vr for iframes, you can
<iframe src="https://foo.bar" allow="vr"></iframe> to grant vr to this iframe.

Bug:  666767 
Change-Id: I48d7accf8553d6a9ac19d9f41dbbce2ff9934579
Reviewed-on: https://chromium-review.googlesource.com/636663
Reviewed-by: Ian Vollick <vollick@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Biao She <bshe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#498674}
[modify] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/content/common/feature_policy/feature_policy.cc
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/feature-policy/resources/feature-policy-webvr.html
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-disabled-by-feature-policy.https.sub.html
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-disabled-by-feature-policy.https.sub.html.headers
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-enabled-by-feature-policy-attribute-redirect-on-load.https.sub.html
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-enabled-by-feature-policy-attribute.https.sub.html
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-enabled-by-feature-policy.https.sub.html
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-enabled-by-feature-policy.https.sub.html.headers
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-enabled-on-self-origin-by-feature-policy.https.sub.html
[add] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/LayoutTests/external/wpt/webvr/webvr-enabled-on-self-origin-by-feature-policy.https.sub.html.headers
[modify] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
[modify] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/Source/platform/feature_policy/FeaturePolicy.cpp
[modify] https://crrev.com/36e485aae6fcb3231843941f750df0428bcb401d/third_party/WebKit/public/platform/WebFeaturePolicyFeature.h