Roll src/third_party/skia 21d4b4c50dbe..6c3879dcec38 (3 commits)

https://skia.googlesource.com/skia.git/+log/21d4b4c50dbe..6c3879dcec38


git log 21d4b4c50dbe..6c3879dcec38 --date=short --no-merges --format='%ad %ae %s'
2018-11-01 csmartdalton@google.com ccpr: Age out path cache entries
2018-11-01 mtklein@google.com limit range of surface sizes in surface_image_unity
2018-11-01 michaelludwig@google.com Switch to postConcat from preConcat


Created with:
  gclient setdep -r src/third_party/skia@6c3879dcec38

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-autoroll

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=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
TBR=herb@chromium.org

Change-Id: I4c5a3cc51029937d829e1e4caa7d7eeb4ca96e77
Reviewed-on: https://chromium-review.googlesource.com/c/1313688Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#604764}

DEPS

@@ -116,7 +116,7 @@ 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': '21d4b4c50dbede761f474114956041eb46d1cc6b',
+  'skia_revision': '6c3879dcec385c72ff75eb88b90477af01f75dec',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.