GitLab

Adds support for using render tests for VR UI through
VR's ability to dump the frame buffer to disk.

We can't use the standard approach of passing
RenderTestRule a View to render since most of the VR UI
is rendered natively using Skia. Instead, we refactor
RenderTestRule slightly to support taking either a
View or a Bitmap, then pass it the Bitmap of the
frame buffer dump.

Bug: 904012

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: Icebfff58cea4ac8ab29fb4dbadc715d729729eda
Reviewed-on: https://chromium-review.googlesource.com/c/1241471Reviewed-by: Peter Conn <peconn@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607340}