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Also, move UI support source out of the UI library.  Those files are
meant to supply capabilitie to the UI library, but not live in the
library itself.

BUG=
R=acondor

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: Ice761aa2d0f18f32bf9600e4a202421f5f705e51
Reviewed-on: https://chromium-review.googlesource.com/1179979Reviewed-by: Aldo Culquicondor <acondor@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584154}