This is helpful for figuring out if we can support the DEBUG
property when initializing an EGL context. It also will be
necessary down the line for Android.

Bug: angleproject:4596
Bug: b/154921118
Bug: angleproject:4606
Change-Id: I01c2cbaa21495e3620b7858f2a309c9a884033ec
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2176277
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>