Roll Skia to 988f54e4689b3d9fb6d5220e02b418f5cfa2b6db (#6931)

https://github.com/flutter/flutter/issues/24402
https://github.com/flutter/flutter/issues/24289
https://github.com/flutter/flutter/issues/24391
https://github.com/flutter/flutter/issues/24517
https://github.com/flutter/flutter/issues/23900

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': 'eb35650f9177d30e59cf6289a834ce1bb86cdfb7',
+  'skia_revision': '988f54e4689b3d9fb6d5220e02b418f5cfa2b6db',
 
   # 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: d743c750c31db65e8ba714b02e51934b
+Signature: ee0a1574bb6026ffa4292566b01d932d
 
 UNUSED LICENSES: