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OpenVR and Oculus devices may be destroyed before the render loop is
created.  If this happens we may crash because we call render_loop_->IsRunning().

Next, if we don't call render_loop_->Stop(), the render_loop_'s bindings will be
destroyed on the main thread rather than the render loop thread.

BUG=868072

Cq-Include-Trybots: luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ibf12af3c38cfa8ed8edf1aebe431a3606476bba7
Reviewed-on: https://chromium-review.googlesource.com/1151952Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578455}