With dynamic shaders we may have multiple shader executables per
program binary. We must store the uniforms outside the executable,
in the program binary, to be consistent between variations.

Change-Id: I1b29a5d78c72dede8562d4878569b609536ba074
Reviewed-on: https://chromium-review.googlesource.com/183586Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>