Roll src/third_party/skia e62bf561638c..990bfc785891 (2 commits) (#8569)

https://skia.googlesource.com/skia.git/%2Blog/e62bf561638c..990bfc785891

git log e62bf561638c60550c35e81b1606843ed74bcfef..990bfc78589117325ce56d18afdfab303c830492 --date=short --no-merges --format=%ad %ae %s
2019-04-12 herb@google.com Convert SkGlyph::toMask() to SkGlyph::mask()
2019-04-11 reed@google.com add utility for caching char2glyph

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 (egdaniel@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': 'e62bf561638c60550c35e81b1606843ed74bcfef',
+  'skia_revision': '990bfc78589117325ce56d18afdfab303c830492',
 
   # 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: 6b8c1bcb82a7bb982213a08e24bfb734
+Signature: f040b5acfcf16a2b7650e7378e70a485
 
 UNUSED LICENSES:
 
@@ -6014,6 +6014,8 @@ FILE: ../../../third_party/skia/src/gpu/vk/GrVkSecondaryCBDrawContext.cpp
 FILE: ../../../third_party/skia/src/gpu/vk/GrVkSecondaryCBDrawContext.h
 FILE: ../../../third_party/skia/src/sksl/SkSLDefines.h
 FILE: ../../../third_party/skia/src/sksl/SkSLOutputStream.cpp
+FILE: ../../../third_party/skia/src/utils/SkCharToGlyphCache.cpp
+FILE: ../../../third_party/skia/src/utils/SkCharToGlyphCache.h
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 Copyright 2019 Google Inc.