Roll src/third_party/skia dcc8c5431bcb..1b5b51de558d (5 commits)

https://skia.googlesource.com/skia.git/+log/dcc8c5431bcb..1b5b51de558d

git log dcc8c5431bcb..1b5b51de558d --date=short --first-parent --format='%ad %ae %s'
2020-01-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 77c4d4c4..243744c2 (487 commits)
2020-01-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 34e16df059f8..6c3dc3581eaf (2 commits)
2020-01-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 086aded3cb74..2bc9cc12f0b0 (19 commits)
2020-01-29 mtklein@google.com remove more vtune references
2020-01-29 mtklein@google.com start on 2pt conical gradients

Created with:
  gclient setdep -r src/third_party/skia@1b5b51de558d

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 reed@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
Bug: None
Tbr: reed@google.com
Change-Id: Ib5adec88e352db347bb4f6c86cc9591f74b3b57a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027002Reviewed-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@{#736259}

DEPS

@@ -177,7 +177,7 @@ 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': 'dcc8c5431bcbac04f9c4685512ec661d511205b6',
+  'skia_revision': '1b5b51de558d1ec1f3f7c34ee224ac081d76f338',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.