Roll src/third_party/skia 31c4bcb210bd..8b0f9d18ddf8 (3 commits)

https://skia.googlesource.com/skia.git/+log/31c4bcb210bd..8b0f9d18ddf8


git log 31c4bcb210bd..8b0f9d18ddf8 --date=short --no-merges --format='%ad %ae %s'
2019-01-03 mtklein@google.com tear down one-big-switch SkRasterPipeline backend
2019-01-03 reed@google.com rm legacy FontMetrics from docs
2019-01-03 reed@google.com remove legacy fontmetrics flag


Created with:
  gclient setdep -r src/third_party/skia@8b0f9d18ddf8

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=bungeman@chromium.org

Change-Id: Ib9eae17be5535959faa2403b60ecf2efb9eeac8f
Reviewed-on: https://chromium-review.googlesource.com/c/1394687Reviewed-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@{#619767}

DEPS

@@ -121,7 +121,7 @@ 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': '31c4bcb210bd1232ce8c15ff659b6807b9437466',
+  'skia_revision': '8b0f9d18ddf8af2ae620502af8ef4f64864ddaa5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.