Roll src/third_party/dart 7ed1690..b20c35c (9 commits) (#16648)

Author: skia-flutter-autoroll

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '7ed1690b4ed6b56bc818173dff41a7a2530991a2',
+  'dart_revision': 'b20c35c7d90f790048ae54520d88e7b5bb158eaf',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 33b02d61e5df5b75965927eb20ab22df
+Signature: ebfb795de41787f5b9dd9d56bf985e90
 
 UNUSED LICENSES:
 
@@ -7769,6 +7769,8 @@ FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/native_type.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/native_type.h
 FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/recognized_method.cc
 FILE: ../../../third_party/dart/runtime/vm/compiler/ffi/recognized_method.h
+FILE: ../../../third_party/dart/runtime/vm/compiler/write_barrier_elimination.cc
+FILE: ../../../third_party/dart/runtime/vm/compiler/write_barrier_elimination.h
 FILE: ../../../third_party/dart/runtime/vm/dispatch_table.cc
 FILE: ../../../third_party/dart/runtime/vm/dispatch_table.h
 FILE: ../../../third_party/dart/runtime/vm/field_table.cc