Add functionality to capture GLenum and GLbitfield parameters as enum
names instead of values.

Bug: angleproject:3611
Change-Id: I7ddc21093d44d1480b205563f30d89f82779b1f1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1724460
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>