Rename GrFragmentProcessor::MulOutputByInputUnpremulColor to MakeInputPremulAndMulByOutput.

Change-Id: I33d74ddb8a7836e8f1922a5ae73f0adb74d59db3
Reviewed-on: https://skia-review.googlesource.com/7609
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
4 files changed