Roll src/third_party/skia 75cebbe5d303..293e1d8f8ba7 (2 commits)

https://skia.googlesource.com/skia.git/+log/75cebbe5d303..293e1d8f8ba7

git log 75cebbe5d303..293e1d8f8ba7 --date=short --first-parent --format='%ad %ae %s'
2020-05-18 johnstiles@google.com Clarify doc comments to document the meaning of 'hairline'.
2020-05-18 bungeman@google.com Cache hb_face.

Created with:
  gclient setdep -r src/third_party/skia@293e1d8f8ba7

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 lovisolo@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: lovisolo@google.com
Change-Id: I57b6ec7fc80932ee45e44cd3b2769f571fecb38a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207899Reviewed-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@{#769882}

DEPS

@@ -178,7 +178,7 @@ 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': '75cebbe5d3037cd8ebfce8379c629a7dd6fe787b',
+  'skia_revision': '293e1d8f8ba7526dca4ef1e2d7c320dcc99d511b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.