Roll src/third_party/skia/ a3e9271ec..f9af55641 (2 commits)

https://skia.googlesource.com/skia.git/+log/a3e9271ec41d..f9af55641a6d

$ git log a3e9271ec..f9af55641 --date=short --no-merges --format='%ad %ae %s'
2017-12-05 angle-deps-roller Roll skia/third_party/externals/angle2/ f5be5bafa..12a18ad35 (10 commits)
2017-12-05 kjlubick Don't set min frequency for Android devices

Created with:
  roll-dep src/third_party/skia


The AutoRoll server is located here: https://autoroll.skia.org

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=rmistry@chromium.org

Change-Id: I0b682fa7acd4cdb0ba05cd7efad3c393a04e4387
Reviewed-on: https://chromium-review.googlesource.com/809923Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521918}

DEPS

@@ -74,7 +74,7 @@ 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': 'a3e9271ec41db6c3b6886e50053f37d345ab1d5c',
+  'skia_revision': 'f9af55641a6d67730d900c95004840e13a859a7d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.