Cast display for eglGetPlatformDisplayEXT(). Cast the second parameter of eglGetPlatformDisplayEXT() to the correct type to stop compiler complaining. BUG=angleproject:1297 Change-Id: I37260edbd0fb6b92c24b556b15ea8206295e12d4 Reviewed-on: https://chromium-review.googlesource.com/354740 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Frank Henigman <fjhenigman@chromium.org>