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Adds support for fake controller input when using OpenVR
in the VR browser tests. This is done by adding several
new functions and structs to the existing test hook and
Mojo interface so that controller data set by a test
is retrievable by the fake OpenVR implementation.

Bug: 863487
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: Ib9da6756df51093126d641e69fbf96ec05f2270b
Reviewed-on: https://chromium-review.googlesource.com/c/1220806
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597258}