Roll src/third_party/skia/ f80f115dd..8c8cb5bfc (2 commits).

https://skia.googlesource.com/skia.git/+log/f80f115dd5ae..8c8cb5bfc547

$ git log f80f115dd..8c8cb5bfc --date=short --no-merges --format='%ad %ae %s'
2017-01-06 mtklein simplify by removing _d stages
2017-01-06 brianosman Revert "Revert "Hard code bicubic coefficients in the shader""

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
TBR=csmartdalton@google.com

Review-Url: https://codereview.chromium.org/2615013004
Cr-Commit-Position: refs/heads/master@{#441964}

DEPS

@@ -40,7 +40,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': 'f80f115dd5aebdfebe6c04f41f4c99a03a782e34',
+  'skia_revision': '8c8cb5bfc547229422a33db5c344fe1542bf00a7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.