Roll src/third_party/skia 7a538b1eeccd..078e8faa26d8 (1 commits) (#13978)

https://skia.googlesource.com/skia.git/+log/7a538b1eeccd..078e8faa26d8

git log 7a538b1eeccd..078e8faa26d8 --date=short --no-merges --format='%ad %ae %s'
2019-11-22 bsalomon@google.com Revert "Make FP optimizations helpers use SkAlphaType not GrColorType"

Created with:
  gclient setdep -r src/third_party/skia@078e8faa26d8

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC robertphillips@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
TBR=robertphillips@google.com

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '7a538b1eeccdbe940de507af9aeaf454952c4aec',
+  'skia_revision': '078e8faa26d8b1f33a92e57f587be011150d1776',
 
   # 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: 381c27cc50b515f1a409143c19c51f31
+Signature: 68d412de34ec10138518fbcb15922cc7
 
 UNUSED LICENSES: