Implemented binding/size/start related queries for uniform buffers.

Change-Id: I9d36c92201a7f0df86b1d882ca6d9f04b372bad6
Reviewed-on: https://swiftshader-review.googlesource.com/4750Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>