Query objects already existed as an extension
for OpenGL ES 2.0, so all that was needed was
to fill in the blanks in the API functions.

Change-Id: I6b48d34bdd8a92e7531bbf6cecb1f4d75b55d144
Reviewed-on: https://swiftshader-review.googlesource.com/2800Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>