Roll src/third_party/skia/ 6da98f109..ab2621d3e (7 commits)

https://skia.googlesource.com/skia.git/+log/6da98f10951f..ab2621d3e2d2

$ git log 6da98f109..ab2621d3e --date=short --no-merges --format='%ad %ae %s'
2018-01-30 caryclark generate tables instead of manual entry
2018-01-30 halcanary SkQP: More logging details.
2018-01-30 angle-skia-autoroll Roll skia/third_party/externals/angle2/ 5dd4ad896..efb5a5c8f (1 commit)
2018-01-29 jvanverth Reduce the amount of padding needed for SDFs.
2018-01-30 egdaniel Add ref counted wrapped around GrTexture ReleaseProc
2018-01-30 fmalita [skottie] Anti-alias masks
2018-01-30 mtklein temporarily disable BadImage test on new ASAN bot

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=bungeman@chromium.org

Change-Id: Ie22a8eddb1da29db49bb939ff4d9db930a3ea1f2
Reviewed-on: https://chromium-review.googlesource.com/893210Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#532926}

DEPS

@@ -83,7 +83,7 @@ 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': '6da98f10951fb99b81b27d318aefb97eb7fd8a9c',
+  'skia_revision': 'ab2621d3e2d2055096b9fbebf16ee443e4ea90fb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.