Roll src/third_party/skia db13d3874846..70ed05e53ad2 (6 commits) (flutter/engine#8599)

https://skia.googlesource.com/skia.git/%2Blog/db13d3874846..70ed05e53ad2

git log db13d38748462b713beeeed33fb0eb9d95c1270e..70ed05e53ad244b3234415b447e5fcd53fb40e3b --date=short --no-merges --format=%ad %ae %s
2019-04-16 reed@google.com Revert "Simplify SkTypeface::charsToGlyphs API to require UTF32 input"
2019-04-17 reed@google.com Revert "Remove includes from SkFontTypes.h"
2019-04-16 csmartdalton@google.com Reland "Add GrDisableColorXPFactory::makeXferProcessor()"
2019-04-16 bungeman@google.com Remove includes from SkFontTypes.h
2019-04-16 reed@google.com Simplify SkTypeface::charsToGlyphs API to require UTF32 input
2019-04-16 bungeman@google.com IWYU for SkCanvas.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 (herb@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': 'db13d38748462b713beeeed33fb0eb9d95c1270e',
+  'skia_revision': '70ed05e53ad244b3234415b447e5fcd53fb40e3b',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: e4826915478bc70bedc3991b23ebc9bd
+Signature: 7e986723b35e27a14d9131c9199c83c4
 
 UNUSED LICENSES: