Roll src/third_party/skia 94a5328..b6f5378 (8 commits) (flutter#7812)

https://skia.googlesource.com/skia.git/%2Blog/94a5328e0e4b..b6f53783337e

git log 94a5328..b6f5378 --date=short --no-merges --format=%ad %ae %s
2019-02-13 [email protected] SkShaper: enable for unit and render tests
2019-02-13 [email protected] fix rawiter::peek
2019-02-12 [email protected] Switch Ops over to using GrRecordingContext
2019-02-13 [email protected] Roll ../src 77b5d9247fd7..1f0e830f475f (486 commits)
2019-02-12 [email protected] Blacklist Codec tests on Wuffs bot
2019-02-13 [email protected] Roll third_party/externals/swiftshader 73c3124..de16f32 (1 commits)
2019-02-12 [email protected] added constant 0 and 1 swizzle components to SkSL
2019-02-13 [email protected] Update go_deps asset

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 ([email protected]), 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': '94a5328e0e4b59286ec0e04e0fabe6a447451f30',
+  'skia_revision': 'b6f53783337e096d6803ba3907044b79b4ac9f6c',
 
   # 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: fad81f79fc8c934ae311f91b879aa530
+Signature: 16ee44df42aee8e098d6bf1d138049e1
 
 UNUSED LICENSES:
 
@@ -2359,6 +2359,7 @@ FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Cl
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-BonusConfigs.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-MSAN.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-SK_USE_DISCARDABLE_SCALEDIMAGECACHE.json
+FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-Wuffs.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-shard_00_10-Coverage.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Release-All-Lottie.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Release-All-SK_FORCE_RASTER_PIPELINE_BLITTER.json