Roll src/third_party/skia/ 8abb9f453..f2c901474 (2 commits)

https://skia.googlesource.com/skia.git/+log/8abb9f453798..f2c901474c24

$ git log 8abb9f453..f2c901474 --date=short --no-merges --format='%ad %ae %s'
2017-07-13 brianosman Add GN arg to allow Flutter-specific API guards
2017-07-14 liyuqian Simplify Sk4i's Min/Max

Created with:
  roll-dep src/third_party/skia


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=ethannicholas@chromium.org

Change-Id: Icac0cbdcd4edbbcec072aba1debaf550a3bd1517
Reviewed-on: https://chromium-review.googlesource.com/572058Reviewed-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@{#486918}

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': '8abb9f45379823f417371d3e99f42629fbccd579',
+  'skia_revision': 'f2c901474c240637c590ebfdf37db6e7d8316ec1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.