Roll src/third_party/skia a753d1a3475d..2a5511307d34 (3 commits) (#7933)

https://skia.googlesource.com/skia.git/%2Blog/a753d1a3475d..2a5511307d34

git log a753d1a3475dcae3ca80fcfffed30c0cc25a349b..2a5511307d341228135a605a73fb6043be62b987 --date=short --no-merges --format=%ad %ae %s
2019-02-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 cf9b2853a7e7..f78131dac076 (3 commits)
2019-02-22 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-22 fmalita@chromium.org [sksg] Use luminance coefficients from SkColorData.h

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': 'a753d1a3475dcae3ca80fcfffed30c0cc25a349b',
+  'skia_revision': '2a5511307d341228135a605a73fb6043be62b987',
 
   # 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: b0a131e6e4c82e5133da7075ff0f6eae
+Signature: 62eb2c14fe4b4428702d88c9ec5b9389
 
 UNUSED LICENSES: