Rework GrSamplerParams to be more compact and use its own wrap mode enum.

The main change is to make GrSamplerParams smaller by making its enums have byte-sized underlying types. The rest is cosmetic.

Change-Id: Ib71ea50612d24619a85e463826c6b8dfb9b445e3
Reviewed-on: https://skia-review.googlesource.com/43200
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
86 files changed