It's undefined what happens if we run into OOM errors when allocating
new resources. To guard against fuzzer issues we can set the buffer
size internally to zero when an allocation fails. This should prevent
GL APIs from reading from the buffer when the contents are internally
inconsistent.

Bug: chromium:1086532
Change-Id: I9ac4becf977bf0521208b2220caba788c21c93f1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2219137
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>