Roll src/third_party/skia 05ff93c..9a049e6 (11 commits) (#7903)

https://skia.googlesource.com/skia.git/%2Blog/05ff93c43ea5..9a049e6ce39d

git log 05ff93c..9a049e6 --date=short --no-merges --format=%ad %ae %s
2019-02-21 bsalomon@google.com SK_API SkExecutor
2019-02-21 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 3f48ecb..0eee332 (1 commits)
2019-02-21 reed@google.com add subpixel tweaking
2019-02-21 skia-autoroll@skia-public.iam.gserviceaccount.com Roll skia/third_party/skcms 9374ba7d790a..b7157d764389 (1 commits)
2019-02-21 reed@google.com remove old code behind SK_SUPPORT_LEGACY_SETLENGTH
2019-02-21 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-21 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader c1fd408..3f48ecb (2 commits)
2019-02-21 thakis@chromium.org Remove another semicolon.
2019-02-21 reed@google.com add test for mac aa on fonts
2019-02-21 fmalita@chromium.org [sksg] Hoist empty-bounds check to base RenderNode
2019-02-20 kjlubick@google.com [canvaskit] Upgrade emscripten to .27

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 (jvanverth@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': '05ff93c43ea57fd62cd1bc36ab7cd9b6112a7ecf',
+  'skia_revision': '9a049e6ce39d9a7c0270b5f52ca21035e71032ef',
 
   # 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: 4d97ab682f6fb8caddbd4000b3db475c
+Signature: 6d414f70a2508ca7c53b28f953a9811a
 
 UNUSED LICENSES:
 
@@ -4900,6 +4900,7 @@ LIBRARY: skia
 ORIGIN: ../../../third_party/skia/gm/compositor_quads.cpp + ../../../third_party/skia/LICENSE
 TYPE: LicenseType.bsd
 FILE: ../../../third_party/skia/gm/compositor_quads.cpp
+FILE: ../../../third_party/skia/gm/mac_aa_explorer.cpp
 FILE: ../../../third_party/skia/gm/mixercolorfilter.cpp
 FILE: ../../../third_party/skia/gm/skbug_8664.cpp
 FILE: ../../../third_party/skia/include/gpu/GrContextThreadSafeProxy.h