More iOS Fixes for SkiaSDLExample.

Fixes up resolution and sets up ES context properly.

Change-Id: I660098905f0d3643b0c7392808833ab564dbd447
Reviewed-on: https://skia-review.googlesource.com/42122
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed