Create a renderer device per GL context. Bug 18572955 Change-Id: I5c05ab7e0bae3581600ab4fcaba7c499fb5987a7 Reviewed-on: https://swiftshader-review.googlesource.com/1521 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com>