Follow the spec more closely and only reserve IDs of vertex arrays and
transform feedback objects before binding.  This saves memory and allows
the glIs* calls to succeed.

BUG=angleproject:1218
BUG=angleproject:1101

Change-Id: I0039680c39c66c1c5506f6a1a9121a71791b77e9
Reviewed-on: https://chromium-review.googlesource.com/316591Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>