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Automates the manual tests from https://crbug.com/887551, which relate
to the Daydream controller while in a WebXR immersive session and
permissions, e.g. ensuring that in-use permissions are displayed when
long-pressing the app button.

As a side-effect, updates the test code for waiting on a VR UI element
to change visibility to instead wait for a specific visibility state.

Bug: 887551
Change-Id: I0f845231d2242c711a7b8d6f1465105ec8dc6383
Reviewed-on: https://chromium-review.googlesource.com/c/1318063Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605452}