Roll src/third_party/skia/ d71c6d199..5546c921e (3 commits)

https://skia.googlesource.com/skia.git/+log/d71c6d1994f6..5546c921e0ca

$ git log d71c6d199..5546c921e --date=short --no-merges --format='%ad %ae %s'
2017-10-18 angle-deps-roller Roll skia/third_party/externals/angle2/ b9cb7f60d..ebf7299e4 (1 commit)
2017-10-17 angle-deps-roller Roll skia/third_party/externals/angle2/ 8a9e0fc23..b9cb7f60d (1 commit)
2017-10-17 benjaminwagner Synchronize public.bzl float-cast-overflow omit list with test.py.

Created with:
  roll-dep src/third_party/skia
BUG=774309


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;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;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=benjaminwagner@chromium.org

Change-Id: I4f4ad7cf3865ab75b485e46ce77942a42f261637
Reviewed-on: https://chromium-review.googlesource.com/724960Reviewed-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@{#509694}

DEPS

@@ -55,7 +55,7 @@ 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': 'd71c6d1994f606e3260304589784f8b9ae69abec',
+  'skia_revision': '5546c921e0ca352585c7c56d629dee69417b530a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.