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Adds the ability to use a mock keyboard during VR instrumentation tests,
which allows arbitrary text input without having to actually click the
keys on the keyboard. This is achieved in a similar way to the mock
controller input, where the keyboard delegate is swapped to the mock
one when necessary.

Also automates one manual test for navigation on URL entry that uses
the new functionality.

Bug: 887523
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:linux_vr;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ia1130df87a154a6771038182883521ede209be99
Reviewed-on: https://chromium-review.googlesource.com/c/1257665Reviewed-by: Aldo Culquicondor <acondor@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596733}