Fix VrShellDelegate creation on Vega

Fixes VR tests failing on Vega due to the special TestVrShellDelegate
construction done via reflection on Vega devices not being updated
when the TestVrShellDelegate's constructor had an extra parameter added

TBR=mthiesse@chromium.org

Bug: 924696
Change-Id: Ib48f64609fad549a2af8078d376bab1601c1da13
Reviewed-on: https://chromium-review.googlesource.com/c/1431837
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625416}
6 files changed