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Modifies an existing test that brings up a keyboard so that it also
inputs text via the keyboard. This is to catch future occurances of
https://crbug.com/874671 where inputting text into the VR Browser's
omnibox would cause a browser crash.

Also installs the latest VR Keyboard APK as part of pre-test setup
in test suites that could potentially use the keyboard.

Bug: 874671, 874696
Change-Id: Ic04d678e14de918fbf159078422c9d5459e8d98d
Reviewed-on: https://chromium-review.googlesource.com/1176876Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585321}