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Currently, the frame/border around the VR browsing content window starts
off opaque, and later becomes transparent due to bindings. This makes
it start off transparent.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Iaaec76ef7b7ba4c8c54a55fc5a591327bb98d9f3
Reviewed-on: https://chromium-review.googlesource.com/1000517
Commit-Queue: Ian Vollick <vollick@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549275}