Set sampler uniform values from binding qualifiers The usual set uniform call is used to set initial sampler uniform values based on binding layout qualifiers. This is the simplest way to ensure that the uniform values are set correctly in both internal data structures of the Program class and on the different backends. This is done as one of the last steps of program linking. TEST=dEQP-GLES31.functional.uniform_binding.sampler* BUG=angleproject:1442 Change-Id: I2f58c98e175f6a10a90042050f4fcbea77ad97ac Reviewed-on: https://chromium-review.googlesource.com/456597 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>