Retrieve the current context and display from EGL. BUG=18110152 Change-Id: Iedddab96b5958b1daef6a41bb968af358afd6561 Reviewed-on: https://swiftshader-review.googlesource.com/1254 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com>