Roll src/third_party/skia 1c94a8fabed7..68300c270916 (4 commits) (flutter#5867)

Auto-roller completed checks. Merging.

Author: skia-flutter-autoroll

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': '1c94a8fabed7196e985a0ed81ce8325c8f606940',
+  'skia_revision': '68300c270916b2740fccdbe6c6dce8f085e83316',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

travis/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: b4bc250fabee117ed72a44a8cdf156a3
+Signature: 0ff53a57d8b9dcec397777902a8fc1da
 
 UNUSED LICENSES:
 
@@ -2116,7 +2116,6 @@ FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Chromecast
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-ASAN.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-T8888.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
@@ -4021,10 +4020,6 @@ FILE: ../../../third_party/skia/src/core/SkMaskBlurFilter.h
 FILE: ../../../third_party/skia/src/core/SkRasterClipStack.h
 FILE: ../../../third_party/skia/src/core/SkSafeMath.h
 FILE: ../../../third_party/skia/src/core/SkSpriteBlitter_RGB565.cpp
-FILE: ../../../third_party/skia/src/core/SkTaskGroup2D.cpp
-FILE: ../../../third_party/skia/src/core/SkTaskGroup2D.h
-FILE: ../../../third_party/skia/src/core/SkThreadedBMPDevice.cpp
-FILE: ../../../third_party/skia/src/core/SkThreadedBMPDevice.h
 FILE: ../../../third_party/skia/src/core/SkUnPreMultiplyPriv.h
 FILE: ../../../third_party/skia/src/core/SkVertices.cpp
 FILE: ../../../third_party/skia/src/core/SkVptr.h