Roll src/third_party/skia 64329094c2a8..8c31f2bf7f15 (4 commits)

https://skia.googlesource.com/skia.git/+log/64329094c2a8..8c31f2bf7f15


git log 64329094c2a8..8c31f2bf7f15 --date=short --no-merges --format='%ad %ae %s'
2019-07-17 reed@google.com use same signature for shader/colorfilters in sksl
2019-07-17 ethannicholas@google.com add support for ctype=SkPMColor4f to GrSkSLFP
2019-07-17 egdaniel@google.com Move verified color attachment flag to FormatInfo.
2019-07-17 bsalomon@google.com Remove kRenderTarget_GrSurfaceFlag, instead pass GrRenderable.


Created with:
  gclient setdep -r src/third_party/skia@8c31f2bf7f15

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-blink-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
TBR=nifong@google.com

Change-Id: I7b2f6c09325e492ef8917ff609291ef735c0f0ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1706672Reviewed-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@{#678340}

DEPS

@@ -144,7 +144,7 @@ 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': '64329094c2a88a0e75bd717bb4e056d894dd7faa',
+  'skia_revision': '8c31f2bf7f154e00952da9bdfbe3accc7691aecf',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.