Roll src/third_party/skia 39da10b5563f..ff2f380fd37a (5 commits)

https://skia.googlesource.com/skia.git/+log/39da10b5563f..ff2f380fd37a

git log 39da10b5563f..ff2f380fd37a --date=short --no-merges --format='%ad %ae %s'
2019-11-18 robertphillips@google.com Only access the scissorState's rect when it is valid
2019-11-18 brianosman@google.com Remove some SK_API from src/
2019-11-18 halcanary@google.com DEPS: add third_party/externals/libgifcodec
2019-11-18 halcanary@google.com GN tool: copy_git_directory.py script
2019-11-18 michaelludwig@google.com Make TessellationHelper resettable

Created with:
  gclient setdep -r src/third_party/skia@ff2f380fd37a

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 robertphillips@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=robertphillips@google.com

Bug: None
Change-Id: I0e5733b3bd23c21874e02dcb3af03fef9f21e602
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1922413Reviewed-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@{#716368}

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': '39da10b5563fc3b8e489fd8c38ddc0e8e0516bd1',
+  'skia_revision': 'ff2f380fd37a9b81bb1ac247c5232f1ea5487213',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.