Roll src/third_party/skia 23e856f36982..6751f171c662 (13 commits)

https://skia.googlesource.com/skia.git/+log/23e856f36982..6751f171c662

git log 23e856f36982..6751f171c662 --date=short --no-merges --format='%ad %ae %s'
2019-11-01 borenet@google.com [recipes] Assert that Git is obtained from CIPD
2019-11-01 borenet@google.com [infra] Make CheckGeneratedFiles use git from CIPD
2019-11-01 mtklein@google.com opaque shaders and srcover -> src
2019-11-01 mtklein@google.com get rid of Uniforms
2019-11-01 michaelludwig@google.com Refactor tessellation metadata to move towards independent inset/outset calculations
2019-11-01 mtklein@google.com paint color -> shader
2019-11-01 mtklein@google.com paint alpha scaling as its own effect
2019-11-01 senorblanco@chromium.org Dawn: fix RTHeight adjustment.
2019-11-01 robertphillips@google.com Reduce max # of AA Quads that can be merged or chained into a single GrTextureOp
2019-11-01 halcanary@google.com tools/git-sync-deps: enforce commit hash in DEPS, not tags or branches
2019-11-01 egdaniel@google.com Use GrSurfaceProxyView for dst proxies.
2019-11-01 mtklein@google.com add --quick to fm
2019-11-01 michaelludwig@google.com Remove extraneous semicolons

Created with:
  gclient setdep -r src/third_party/skia@6751f171c662

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC jcgregorio@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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=jcgregorio@google.com

Bug: chromium:b/143572065
Change-Id: I2758547dbcbd8fa0e9af7632f6ceedf7fc6efb80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894690Reviewed-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@{#711846}

DEPS

@@ -172,7 +172,7 @@ 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': '23e856f369823b5951d2ef18b8980085a3c652f1',
+  'skia_revision': '6751f171c662ca1a566f20bf98bc367aa2840980',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.