Roll src/third_party/skia 68aeec07de4a..db13d3874846 (16 commits) (#8595)

https://skia.googlesource.com/skia.git/%2Blog/68aeec07de4a..db13d3874846

git log 68aeec07de4a1894a5cefde405abcb5a49801df6..db13d38748462b713beeeed33fb0eb9d95c1270e --date=short --no-merges --format=%ad %ae %s
2019-04-16 bungeman@google.com Move SkTLazy.h to src/
2019-04-16 mtklein@google.com Reland "align skvx::Vec<N,T> to N*sizeof(T)"
2019-04-16 borenet@google.com [infra] Add chrome_release_branch script
2019-04-16 mtklein@google.com roll libpng to 1.6.37
2019-04-16 mtklein@google.com pass SkVx::Vec arguments as const&
2019-04-16 egdaniel@google.com Revert "Add GrDisableColorXPFactory::makeXferProcessor()"
2019-04-16 bungeman@google.com Remove generateCharFromGlyph and charToGlyphID.
2019-04-16 ethannicholas@google.com added more SPIR-V RelaxedPrecision decorations
2019-04-16 mtklein@google.com Revert "align skvx::Vec<N,T> to N*sizeof(T)"
2019-04-16 herb@google.com Reduce use of path generation
2019-04-16 mtklein@google.com align skvx::Vec<N,T> to N*sizeof(T)
2019-04-16 csmartdalton@google.com Add GrDisableColorXPFactory::makeXferProcessor()
2019-04-16 bsalomon@google.com Ensure that insetting for blur texture domain doesn't invert domain rect.
2019-04-16 bungeman@google.com Remove deprecated SkPaintFilterCanvas::onFilter.
2019-04-16 kjlubick@google.com WASM build cleanups
2019-04-16 herb@google.com Remove non-canonical font color

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 (herb@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': '68aeec07de4a1894a5cefde405abcb5a49801df6',
+  'skia_revision': 'db13d38748462b713beeeed33fb0eb9d95c1270e',
 
   # 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: 1f1d4e10470c3d2050811a5a9e0f9e1a
+Signature: e4826915478bc70bedc3991b23ebc9bd
 
 UNUSED LICENSES:
 
@@ -2806,7 +2806,6 @@ FILE: ../../../third_party/skia/include/core/SkImageEncoder.h
 FILE: ../../../third_party/skia/include/core/SkImageFilter.h
 FILE: ../../../third_party/skia/include/core/SkMatrix44.h
 FILE: ../../../third_party/skia/include/core/SkSize.h
-FILE: ../../../third_party/skia/include/core/SkTLazy.h
 FILE: ../../../third_party/skia/include/effects/SkLayerDrawLooper.h
 FILE: ../../../third_party/skia/include/gpu/GrRenderTarget.h
 FILE: ../../../third_party/skia/include/gpu/GrTexture.h
@@ -2897,6 +2896,7 @@ FILE: ../../../third_party/skia/src/core/SkPictureRecord.h
 FILE: ../../../third_party/skia/src/core/SkPixelRef.cpp
 FILE: ../../../third_party/skia/src/core/SkPtrRecorder.cpp
 FILE: ../../../third_party/skia/src/core/SkReadBuffer.h
+FILE: ../../../third_party/skia/src/core/SkTLazy.h
 FILE: ../../../third_party/skia/src/core/SkTypefaceCache.cpp
 FILE: ../../../third_party/skia/src/core/SkTypefaceCache.h
 FILE: ../../../third_party/skia/src/core/SkUnPreMultiply.cpp