Roll src/third_party/skia 670c6ec66ef9..dc19391eef52 (2 commits) (#8832)

https://skia.googlesource.com/skia.git
/%2Blog/670c6ec66ef9..dc19391eef52

git log 670c6ec66ef91edad12201078413a4256de43e01..dc19391eef526cee90fcc2391fb0404c05702498 --date=short --no-merges --format=%ad %ae %s
2019-05-02 halcanary@google.com SkShaper: new benchmarks
2019-05-03 ethannicholas@google.com Revert "Child fragment processors are now written as separate functions"

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 (ethannicholas@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': '670c6ec66ef91edad12201078413a4256de43e01',
+  'skia_revision': 'dc19391eef526cee90fcc2391fb0404c05702498',
 
   # 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: 1307f36d46669344949662968c626bd6
+Signature: 0596bbe39e5f53efb086eec8502b1865
 
 UNUSED LICENSES:
 
@@ -4203,8 +4203,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ====================================================================================================
 LIBRARY: skia
-ORIGIN: ../../../third_party/skia/docs/examples/Alpha_Constants_a.cpp + ../../../third_party/skia/LICENSE
+ORIGIN: ../../../third_party/skia/bench/ShaperBench.cpp + ../../../third_party/skia/LICENSE
 TYPE: LicenseType.bsd
+FILE: ../../../third_party/skia/bench/ShaperBench.cpp
 FILE: ../../../third_party/skia/docs/examples/Alpha_Constants_a.cpp
 FILE: ../../../third_party/skia/docs/examples/Alpha_Constants_b.cpp
 FILE: ../../../third_party/skia/docs/examples/Alpha_Type_Opaque.cpp