Roll external/skia 65048139b..47238c79c (5 commits)
https://skia.googlesource.com/skia.git/+log/65048139b..47238c79c
2017-08-10 reed@google.com remove guard for google3
2017-08-10 mtklein@chromium.org Replace interp() with clut_{3,4}D stages.
2017-08-10 bsalomon@google.com Test non-msaa instanced rendering on Mac
2017-08-10 benjaminwagner@google.com Remove --undefok from recipes.
2017-08-10 bsalomon@google.com Move GrAppliedClip into GrPipeline
Test: Presubmit checks will test this change.
Change-Id: Ief462a04fc590a213da561074b19253b1a8c28fc