Roll src/third_party/skia 50e24d7d5f52..26490759e464 (3 commits) (#7745)

https://skia.googlesource.com/skia.git/%2Blog/50e24d7d5f52..26490759e464

git log 50e24d7d5f52724b4286078a813eb253e710fe47..26490759e46483558627c9132e31f4b97cf052ac --date=short --no-merges --format=%ad %ae %s
2019-02-08 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset
2019-02-07 ericrk@chromium.org Fix issue where command buffer was skipped if drawing a single drawable
2019-02-08 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader c81766320762..7fb0b73b1aa7 (1 commits)

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 (fmalita@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': '50e24d7d5f52724b4286078a813eb253e710fe47',
+  'skia_revision': '26490759e46483558627c9132e31f4b97cf052ac',
 
   # 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: 245c8f04811974866afdeaff80f56139
+Signature: f6b697affa5493d514e7ad4decee91e7
 
 UNUSED LICENSES: