Roll src/third_party/skia 10d172169f2d..8413ff13fefa (10 commits) (#8741)

https://skia.googlesource.com/skia.git
/%2Blog/10d172169f2d..8413ff13fefa

git log 10d172169f2d2184d407632276352b401e4111da..8413ff13fefa1e88cd3fc67ebaed87c9eb3419c7 --date=short --no-merges --format=%ad %ae %s
2019-04-24 mtklein@google.com SKIA_IMPLEMENTATION is only relevant in shared builds
2019-04-25 fmalita@chromium.org [skottie] Parented camera support
2019-04-25 brianosman@google.com Add SkSL editing to Viewer in Vulkan backend
2019-04-25 brianosman@google.com Blacklist GL processor tests on GalaxyS6, too
2019-04-25 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-25 fmalita@chromium.org [skottie] Fix camera z-rotation
2019-04-25 brianosman@google.com Normalize storage of shader strings in the cache
2019-04-24 halcanary@google.com Experimental: text editor
2019-04-25 brianosman@google.com Blacklist GL processor tests on low-end Android devices
2019-04-25 mtklein@google.com roll libpng to pre-1.6.38

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 (mtklein@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': '10d172169f2d2184d407632276352b401e4111da',
+  'skia_revision': '8413ff13fefa1e88cd3fc67ebaed87c9eb3419c7',
 
   # 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: cb0dc4a6d2b4f54b27085fcfb3302490
+Signature: 5924f585f00089f00b6d107419c4f1b5
 
 UNUSED LICENSES:
 
@@ -5287,6 +5287,7 @@ FILE: ../../../third_party/skia/docs/examples/Text_Size.cpp
 FILE: ../../../third_party/skia/docs/examples/Text_Skew_X.cpp
 FILE: ../../../third_party/skia/docs/examples/Typeface_Methods.cpp
 FILE: ../../../third_party/skia/docs/examples/Xor.cpp
+FILE: ../../../third_party/skia/experimental/editor/editor_application.cpp
 FILE: ../../../third_party/skia/gm/crbug_918512.cpp
 FILE: ../../../third_party/skia/src/gpu/GrPersistentCacheUtils.h
 FILE: ../../../third_party/skia/src/gpu/effects/GrComposeLerpEffect.fp