Remove GrFragmentProcessor::computeInvariantOutput

Change-Id: If475730103052c6097eb91be06808fb723b70bf8
Reviewed-on: https://skia-review.googlesource.com/8330
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
75 files changed