Roll src/third_party/skia f2d9b865d736..71c0e9422038 (13 commits) (#8413)

https://skia.googlesource.com/skia.git/%2Blog/f2d9b865d736..71c0e9422038

git log f2d9b865d73631d0052a323558b3c083f7e05188..71c0e94220380f4cbb3a8ba462ef9036fa7ab1ff --date=short --no-merges --format=%ad %ae %s
2019-04-02 mtklein@google.com We don't actually use thesee extensions with GLES
2019-04-02 bsalomon@google.com Revert "Inset blur domain a tiny bit to prevent certain GPUs from sampling transparent black from scratch textures."
2019-04-02 mtklein@google.com add skottie support to fm
2019-04-02 mtklein@google.com allow skipped source/backend pairs in fm
2019-04-02 jvanverth@google.com Fix some more Metal and iOS leaks
2019-04-02 brianosman@google.com Initialize renderability in GrMockOptions
2019-03-29 egdaniel@google.com Remove read access flags from src of memory barriers.
2019-04-02 robertphillips@google.com Add tracking of work to GrVkCommandBuffer
2019-04-02 brianosman@google.com Remove samples that aren't built
2019-04-02 mtklein@google.com allow GMs to fail in DM
2019-04-02 brianosman@google.com Remove redundant setup code in readSurfacePixels
2019-04-02 jvanverth@google.com Updates to iOS build
2019-04-01 herb@google.com Refactor main GPU glyph decisions

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 (jlavrova@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': 'f2d9b865d73631d0052a323558b3c083f7e05188',
+  'skia_revision': '71c0e94220380f4cbb3a8ba462ef9036fa7ab1ff',
 
   # 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: 6928cdbcf2200936c961f80cf7e741cc
+Signature: 2d6c6916c1b3db8760ed776b42eb606f
 
 UNUSED LICENSES:
 
@@ -2827,7 +2827,6 @@ FILE: ../../../third_party/skia/samplecode/SampleBigGradient.cpp
 FILE: ../../../third_party/skia/samplecode/SampleBitmapRect.cpp
 FILE: ../../../third_party/skia/samplecode/SampleCamera.cpp
 FILE: ../../../third_party/skia/samplecode/SampleCircle.cpp
-FILE: ../../../third_party/skia/samplecode/SampleClamp.cpp
 FILE: ../../../third_party/skia/samplecode/SampleClip.cpp
 FILE: ../../../third_party/skia/samplecode/SampleColorFilter.cpp
 FILE: ../../../third_party/skia/samplecode/SampleComplexClip.cpp
@@ -2850,7 +2849,6 @@ FILE: ../../../third_party/skia/samplecode/SamplePatch.cpp
 FILE: ../../../third_party/skia/samplecode/SamplePath.cpp
 FILE: ../../../third_party/skia/samplecode/SamplePathClip.cpp
 FILE: ../../../third_party/skia/samplecode/SamplePathEffects.cpp
-FILE: ../../../third_party/skia/samplecode/SamplePathFill.cpp
 FILE: ../../../third_party/skia/samplecode/SamplePoints.cpp
 FILE: ../../../third_party/skia/samplecode/SamplePolyToPoly.cpp
 FILE: ../../../third_party/skia/samplecode/SampleRegion.cpp