Roll src/third_party/skia 12fb9cfeee07..439da2812f74 (6 commits)

https://skia.googlesource.com/skia.git/+log/12fb9cfeee07..439da2812f74


git log 12fb9cfeee07..439da2812f74 --date=short --no-merges --format='%ad %ae %s'
2018-08-06 swiftshader-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll third_party/externals/swiftshader dd4c8631343f..02956e4cced0 (1 commits)
2018-08-06 benjaminwagner@google.com Update remaining Mac bots to 10.13.6, except iOS builds.
2018-08-06 caryclark@skia.org clean up includes
2018-08-06 jvanverth@google.com More SkOffsetSimplePolygon optimizations.
2018-08-06 bsalomon@google.com Store GrMeshDrawOps' meshes in GrOpFlushState's arena.
2018-08-06 egdaniel@google.com Start adding support for some base extensions which others build on.


Created with:
  gclient setdep -r src/third_party/skia@439da2812f74

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;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel

BUG=chromium:862292
TBR=djsollen@chromium.org

Change-Id: I5bbbf92917eb2917d6cb9214fcf78f070934fa22
Reviewed-on: https://chromium-review.googlesource.com/1163117Reviewed-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@{#580908}

DEPS

@@ -105,7 +105,7 @@ 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': '12fb9cfeee071930b05ef37ad72419ae2e1b2592',
+  'skia_revision': '439da2812f746dcfc8a736ac7bc84ffbc815231f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.