Roll Skia from 5ca9d1a to f08a82b (3 revisions)

https://skia.googlesource.com/skia.git/+log/5ca9d1a3414a..f08a82b52dbf

2020-06-16 [email protected] Return tuple from GrConvexPolyEffect::Make denoting success or failure.
2020-06-16 [email protected] Support viewing/changing backend shaders in Viewer
2020-06-16 [email protected] [skottie] Simplify SkColor conversion

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 [email protected] 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/+doc/master/autoroll/README.md

Author: skia-flutter-autoroll

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': '5ca9d1a3414ad89ea4f96a3286f7dc146ee76f2f',
+  'skia_revision': 'f08a82b52dbff3fe06eb3fed7d4db4e1d907d706',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: ec8ce418f19e73d70f54d486ded8fb47
+Signature: 96856fb476332fa26aeeaf04f26d4b14
 
 UNUSED LICENSES: