Roll src/third_party/skia ec85f407bfee..b83cc76a5e3a (15 commits) (#12472)

https://skia.googlesource.com/skia.git/+log/ec85f407bfee..b83cc76a5e3a

git log ec85f407bfee..b83cc76a5e3a --date=short --no-merges --format='%ad %ae %s'
2019-09-26 mtklein@google.com Reland "hsw::S32_alpha_D32_filter_DX"
2019-09-26 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-26 mtklein@google.com reformat .gn files
2019-09-26 csmartdalton@google.com Reland "Remove the resolve rect and resolve types from GrRenderTarget"
2019-09-26 halcanary@google.com experimental/skottie_ios: Add methods to SkottieMtkView
2019-09-26 mtklein@google.com roll GN
2019-09-26 mtklein@google.com Revert "hsw::S32_alpha_D32_filter_DX"
2019-09-26 kjlubick@google.com [canvaskit] remove debugging code
2019-09-26 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-26 egdaniel@google.com Fix vulkan caps checks for external formats.
2019-09-26 robertphillips@google.com Add mipmap support to SkPixmap flavor of createBackendTexture
2019-09-26 csmartdalton@google.com Revert "Remove the resolve rect and resolve types from GrRenderTarget"
2019-09-26 kjlubick@google.com [canvaskit] Create SkFontMgr from passed in data
2019-09-26 mtklein@google.com hsw::S32_alpha_D32_filter_DX
2019-09-26 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@b83cc76a5e3a

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC bungeman@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
TBR=bungeman@google.com

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': 'ec85f407bfee58f1d8b80966256cf746bde2591a',
+  'skia_revision': 'b83cc76a5e3abeb1bdebac0ce389762503d4f0cb',
 
   # 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: e26c0f7e6a37e4446457835268bb82b7
+Signature: bbd2af5f726419e37ee57206f05911f6
 
 UNUSED LICENSES:
 
@@ -3794,6 +3794,7 @@ FILE: ../../../third_party/skia/include/gpu/gl/GrGLAssembleHelpers.h
 FILE: ../../../third_party/skia/include/private/GrGLTypesPriv.h
 FILE: ../../../third_party/skia/include/private/SkThreadAnnotations.h
 FILE: ../../../third_party/skia/modules/canvaskit/WasmAliases.h
+FILE: ../../../third_party/skia/modules/canvaskit/fonts/nofonts.cpp
 FILE: ../../../third_party/skia/modules/canvaskit/particles_bindings.cpp
 FILE: ../../../third_party/skia/modules/canvaskit/skottie_bindings.cpp
 FILE: ../../../third_party/skia/modules/particles/include/SkCurve.h