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Adds test utility code that allows Chrome to think it's received an intent
from a trusted app. This allows us to test Chrome's ability to auto present
WebVR content when given a link from a trusted app (or test its rejection
if the app is not trusted). Also adds one test using the new code.

Also contains a drive-by fix for flakiness in
WebVrTransitionTest#testNfcFiresVrdisplayactivate caused by a race
condition when adding the vrdisplayactivate listener.

Bug: 746086
Change-Id: Ic6b55df18d915a4e36b36ca43bd11f4c773f6d33
Reviewed-on: https://chromium-review.googlesource.com/578527
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488408}