The major and minor versions in EGLPlatformParameters are for the backend
version (eg D3D 10 vs 10.1 vs 11.0), not the GLES version exposed.

BUG=angleproject:3499

Change-Id: I4bf89769b4eab397cdc2e3c51ed94c1e57c4d54b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1643421
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>