Support creating a Surface from a user pointer.

Bug 21716622

Change-Id: Ifa5940c17932066b3860ff148be8b6b2bec726c0
Reviewed-on: https://swiftshader-review.googlesource.com/3444
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
2 files changed