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The models are the means by which the UI share its state with other
components. PlatformController should remain unknown to the UI.

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: I48a917b2e144843173102494fe1b764cd30883f4
Reviewed-on: https://chromium-review.googlesource.com/1177894Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583794}