Roll Skia from 85fa756 to d6f2338 (3 revisions)

https://skia.googlesource.com/skia.git/+log/85fa75616dfe..d6f2338ab194

2020-12-16 brianosman@google.com SkSL IR normalization: Convert while loops to for loops
2020-12-16 bungeman@google.com Remove SkScalerContext::getGlyphCount.
2020-12-16 johnstiles@google.com Pass a shared_ptr to Inliner::inlineCall.

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 tdenniston@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/+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': '85fa75616dfe4666e83fd1f84415855a6fc56726',
+  'skia_revision': 'd6f2338ab194ca3cb58c52e24f8c530c51769cb5',
 
   # 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: 1792678dacbcbbffb692725b6e184a51
+Signature: 581e1cac4e57e34424b59550c956c75e
 
 UNUSED LICENSES:
 
@@ -794,7 +794,6 @@ FILE: ../../../third_party/skia/src/sksl/ir/SkSLUnresolvedFunction.h
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLVarDeclarations.h
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLVariable.h
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLVariableReference.h
-FILE: ../../../third_party/skia/src/sksl/ir/SkSLWhileStatement.h
 FILE: ../../../third_party/skia/src/utils/SkMultiPictureDocument.cpp
 FILE: ../../../third_party/skia/src/utils/SkMultiPictureDocument.h
 FILE: ../../../third_party/skia/src/utils/SkMultiPictureDocumentPriv.h