Enable WebVR origin trial experiments.

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in

Index: third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in
diff --git a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in
index 61309cc3eb33afe50f6060a6f39bd8e243bd98b2..c62a2058f583b12d0229fa020f59600dc3663d26 100644
--- a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in
+++ b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in
@@ -101,7 +101,7 @@ ForeignFetch status=experimental, origin_trial_feature_name=ForeignFetch
 FramebustingNeedsSameOriginOrUserGesture status=stable
 FullscreenUnprefixed status=test
 FrameTimingSupport status=experimental
-GamepadExtensions
+GamepadExtensions implied_by=WebVR

[iclelland, 2016/10/05 21:55:57]

You can add origin_trial_feature_name=WebVR here, and then the same token will
enable both. Origin trials doesn't handle implied_by dynamically.

[amp, 2016/10/05 22:04:43]

That sounds great.  Will I need to update the idl's for the GamepadExtensions to
refer to the WebVR extensions or can those remain as is?  (for example
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/gamepa...)

[chasej, 2016/10/05 22:46:47]

You will need to update the IDLs for the GamepadExtensions as well. Note that
you'll need to change it from [RuntimeEnabled=GamepadExtensions] to
[OriginTrialEnabled=GamepadExtensions]. The point is to use the runtime flag
name, not the origin trial feature name.

 GeometryInterfaces status=experimental, implied_by=CompositorWorker
 GetUserMedia status=stable
 GlobalCacheStorage status=stable
@@ -243,7 +243,7 @@ WebBluetooth origin_trial_feature_name=WebBluetooth
 WebGLDraftExtensions status=experimental
 WebGLImageChromium
 WebUSB status=experimental, origin_trial_feature_name=WebUSB
-WebVR
+WebVR origin_trial_feature_name=WebVR
 WebVTTRegions status=experimental
 V8BasedStructuredClone
 V8IdleTasks