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A controller delegate is responsible for updating the controller, detect
gestures and produce a model to be sent to the Ui. This CL introduces 2
delegates for VrShellGl, one for production and one for testing.

This is the first step on a major refactoring on which VrShellGl
disappears in favor of a cross platform RenderLoop, composed of platform
specific delegates for each of its functions.

A revert to https://crrev.com/c/1121670 was needed to get the
chrome_public_test_vr_apk built properly.

Bug: 767282, 848494
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: Ib68f975ce4e5e39fc7ebb5cf386b400f48039f4e
Reviewed-on: https://chromium-review.googlesource.com/1151623Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Amirhossein Simjour <asimjour@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580178}