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The RenderLoopFactory is responsible of instantiating the delegates
that Ui and RenderLoop require. In this CL, we are still instantiating
a VrShellGl object, as the split-up has not been completed yet. Also, we
make sure that the variables passed to VrGLThread are freed once the
RenderLoop has been built.

The testapp starts to be prepared to make use of RenderLoop. We simplify
the VrTestContext creation (soon to be the RenderLoop) by initializing it
once a GL context was set.

Bug=767282

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: Ie0f580f77fb109463dc41093919a7c535976e321
Reviewed-on: https://chromium-review.googlesource.com/1175852Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583663}