[meta] Move from Geckoview nightly to beta

[philip-lamb]

Hardware

All

Steps to Reproduce

Current Behavior

We currently build from Geckoview nightly.

Expected Behavior

We should be building from Geckoview beta. Amongst other things, nightly has additional debug logging/tracing included.

Possible Solution

Identify all Geckoview functionality that we depend on that is currently in nightly and when it will land in Geckoview beta.

Context

Direct dependencies (add in the format shown)

• needs Widevine EME playback UI support #967

List of things fixed in GV that we must wait to transition to GV beta:

• WebVR controllers not visible after the latest GV update #1049 & Update GV to 68.0.20190404063228 #1060

Other GV bugs tracked in Bugzilla:
Fixed in GV 68:

• https://bugzilla.mozilla.org/show_bug.cgi?id=1528279

[bluemarvin]

I think we also need a good strategy for making it easy to test against nightly. Waiting for features to hit beta is too late to wait to find bugs.

[philip-lamb]

needs #1127

[cvan]

needs #1127

done 👍

[philip-lamb]

I'm going to close this as tackling the issue of using a stable geckoview build needs to be addressed via a different strategy and there's nothing actionable in this ticket.