Roll src/third_party/skia/ 267641a90..a184ac7e0 (5 commits)

https://skia.googlesource.com/skia.git/+log/267641a90cb1..a184ac7e0cdb

$ git log 267641a90..a184ac7e0 --date=short --no-merges --format='%ad %ae %s'
2017-08-22 bsalomon Revert "Revert "Revert "Add GrTextureOp and use to implement SkGpuDevice::drawImage[Rect]() when possible"""
2017-08-22 herb Fix poor handling of nullptr for new blur code
2017-08-22 enne Don't validate() in ~SkPathRef
2017-08-22 brianosman Add GrPrepareCallback, always run at the start of flush
2017-08-22 scroggo Make haveDecodedRow return void

Created with:
  roll-dep src/third_party/skia
BUG=749147


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=jcgregorio@chromium.org

Change-Id: I3c535e2c947d75d30affe0569f30097dfdb9f035
Reviewed-on: https://chromium-review.googlesource.com/627634Reviewed-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@{#496523}

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': '267641a90cb18a430b0a84910f651e2181744fd3',
+  'skia_revision': 'a184ac7e0cdb26919369151f606c194358c94ff5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.