Roll src/third_party/skia 7150513754f5..aa6ca0a8bfc1 (1 commits) (flutter/engine#7582)

https://skia.googlesource.com/skia.git/%2Blog/7150513754f5..aa6ca0a8bfc1

git log 7150513754f5c3bc4848364121e7399b498d4918..aa6ca0a8bfc13050dfa3855fcaa6264586dd2b4b --date=short --no-merges --format=%ad %ae %s
2019-01-24 bsalomon@google.com Require explicit GrWrapCacheable specification in more places.

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 (djsollen@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': '7150513754f5c3bc4848364121e7399b498d4918',
+  'skia_revision': 'aa6ca0a8bfc13050dfa3855fcaa6264586dd2b4b',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 336eef6913684553dcd79a5f23f42915
+Signature: 168c920ac24cbc3585110b2c748cf47e
 
 UNUSED LICENSES: