Expose EGL 1.5. 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>