Roll src/third_party/skia/ 73e21af21..a392dbaa9 (2 commits)

https://skia.googlesource.com/skia.git/+log/73e21af21390..a392dbaa998e

$ git log 73e21af21..a392dbaa9 --date=short --no-merges --format='%ad %ae %s'
2017-03-16 bsalomon Revert "Revert "Revert "Revert "Detect Chrome either by renderer or version strings.""""
2017-03-17 reed Revert "More SkVertices implementation work"

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
TBR=borenet@chromium.org

Change-Id: I14dd58faedbdeecdfe87319012a5750fd46de375
Reviewed-on: https://chromium-review.googlesource.com/456620Reviewed-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@{#457763}

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': '73e21af21390c2806eb1350253233903808edd6b',
+  'skia_revision': 'a392dbaa998e9f137103f7a7e86f89cb7224552f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.