Roll src/third_party/skia 51b9965..c514e7d (13 commits) (#14457)

https://skia.googlesource.com/skia.git/+log/51b99659ed82..c514e7d9be6e

git log 51b9965..c514e7d --date=short --first-parent --format='%ad %ae %s'
2019-12-12 herb@google.com Move the GrGlyph* and vertex data onto the arena alloc.
2019-12-12 halcanary@google.com BUILD.gn: Fix formatting.
2019-12-12 nifong@google.com Parse android layer annotations in debugger, play back layers
2019-12-12 djsollen@google.com Revert "Detach op memory pool from recording context"
2019-12-12 mtklein@google.com don't create out of range enums
2019-12-12 robertphillips@google.com Add compression to Mock backend
2019-12-12 michaelludwig@google.com Detach op memory pool from recording context
2019-12-12 paraboul@gmail.com Use absolute sigma instead of clamping to 0 in SkDropShadowImageFilter.
2019-12-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src cf2545c5111b..636138928516 (444 commits)
2019-12-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 d6053da..6381d7f (11 commits)
2019-12-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 50211670b4bf..07958d452f93 (11 commits)
2019-12-12 robertphillips@google.com Reland "Update FragmentProcessor TextureSampler to hold an GrSurfaceProxyView."
2019-12-12 robertphillips@google.com Revert "Update FragmentProcessor TextureSampler to hold an GrSurfaceProxyView."

Created with:
  gclient setdep -r src/third_party/skia@c514e7d9be6e

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC djsollen@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

Bug: None
Tbr: djsollen@google.com

Author: skia-flutter-autoroll

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '51b99659ed826c5009f9f261a17cf36a61c4702a',
+  'skia_revision': 'c514e7d9be6e97b3976dcde3eec527127a5f5713',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 994037753b8256685e9fb810c0a09a15
+Signature: eb31e5476b0f278ed75cae55cda26348
 
 UNUSED LICENSES: