dEQP: Add EGL 1.5 getPlatformDisplay. This will allow us to pass pointers in the attributes list. This is helpful for the angle::Platform init code. Bug: angleproject:2552 Bug: angleproject:2564 Change-Id: I388d907ad543a61f357c0a51e8242942118bdaea Reviewed-on: https://chromium-review.googlesource.com/1064195 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>