Roll src/third_party/skia f808c5e3afa3..e6a83e160860 (3 commits) (#8795)

https://skia.googlesource.com/skia.git
/%2Blog/f808c5e3afa3..e6a83e160860

git log f808c5e3afa384358a1fb85894e643cc96248d45..e6a83e16086095ffcc14a2b9a37a1b6392100a55 --date=short --no-merges --format=%ad %ae %s
2019-04-30 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-30 michaelludwig@google.com Prevent outset Ws from going negative
2019-04-30 bungeman@google.com IWYU for gms starting with 'a'.

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-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 (ethannicholas@google.com), and stop
the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': 'f808c5e3afa384358a1fb85894e643cc96248d45',
+  'skia_revision': 'e6a83e16086095ffcc14a2b9a37a1b6392100a55',
 
   # 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

-Signature: 3431245f7ddfe37ccf94674fdf52539a
+Signature: 8dea993a420095483d96a152ad4e84a0
 
 UNUSED LICENSES:
 
@@ -1448,7 +1448,6 @@ FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzImageFilterDeserialize.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzPathDeserialize.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzRegionDeserialize.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzRegionSetPath.cpp
-FILE: ../../../third_party/skia/gm/3dgm.cpp
 FILE: ../../../third_party/skia/gm/analytic_gradients.cpp
 FILE: ../../../third_party/skia/gm/androidblendmodes.cpp
 FILE: ../../../third_party/skia/gm/b_119394958.cpp
@@ -1513,6 +1512,7 @@ FILE: ../../../third_party/skia/include/utils/Sk3D.h
 FILE: ../../../third_party/skia/include/utils/SkAnimCodecPlayer.h
 FILE: ../../../third_party/skia/include/utils/SkTextUtils.h
 FILE: ../../../third_party/skia/infra/cts/run_testlab.go
+FILE: ../../../third_party/skia/modules/skottie/gm/3dgm.cpp
 FILE: ../../../third_party/skia/modules/skottie/include/SkottieProperty.h
 FILE: ../../../third_party/skia/modules/skottie/src/SkottieAdapter.cpp
 FILE: ../../../third_party/skia/modules/skottie/src/SkottieAdapter.h
@@ -5578,6 +5578,7 @@ FILE: ../../../third_party/skia/gm/crbug_947055.cpp
 FILE: ../../../third_party/skia/gm/mac_aa_explorer.cpp
 FILE: ../../../third_party/skia/gm/mixercolorfilter.cpp
 FILE: ../../../third_party/skia/gm/overdrawcanvas.cpp
+FILE: ../../../third_party/skia/gm/postercircle.cpp
 FILE: ../../../third_party/skia/gm/samplelocations.cpp
 FILE: ../../../third_party/skia/gm/skbug_8664.cpp
 FILE: ../../../third_party/skia/gm/skbug_8955.cpp