Roll Dart SDK from ecfee8071fda to 4c2c98257c1a (2 revisions) (flutter#20680)

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': 'ecfee8071fda8bf4e74156d8468ebe679b6593ad',
+  'dart_revision': '4c2c98257c1aecfbec8524691860c6b4d2dfccf3',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -53,7 +53,7 @@ vars = {
   'dart_pub_semver_tag': 'v1.4.4',
   'dart_quiver-dart_tag': '246e754fe45cecb6aa5f3f13b4ed61037ff0d784',
   'dart_resource_rev': 'f8e37558a1c4f54550aa463b88a6a831e3e33cd6',
-  'dart_root_certificates_rev': '16ef64be64c7dfdff2b9f4b910726e635ccc519e',
+  'dart_root_certificates_rev': '7e5ec82c99677a2e5b95ce296c4d68b0d3378ed8',
   'dart_shelf_packages_handler_tag': '2.0.0',
   'dart_shelf_proxy_tag': '0.1.0+7',
   'dart_shelf_static_rev': 'v0.2.8',
@@ -193,7 +193,7 @@ deps = {
    Var('dart_git') + '/dart2js_info.git@94ba36cb77067f28b75a4212e77b810a2d7385e9',
 
   'src/third_party/dart/third_party/pkg/dartdoc':
-   Var('dart_git') + '/dartdoc.git@4410c7739eb6be3f4ae12571145d1a3633b54724',
+   Var('dart_git') + '/dartdoc.git@291ebc50072746bc59ccab59115a298915218428',
 
   'src/third_party/dart/third_party/pkg/ffi':
    Var('dart_git') + '/ffi.git@454ab0f9ea6bd06942a983238d8a6818b1357edb',
@@ -319,7 +319,7 @@ deps = {
    Var('dart_git') + '/term_glyph.git@6a0f9b6fb645ba75e7a00a4e20072678327a0347',
 
   'src/third_party/dart/third_party/pkg/test':
-   Var('dart_git') + '/test.git@c6b3fe63eda87da1687580071cad1eefd575f851',
+   Var('dart_git') + '/test.git@e37a93bbeae23b215972d1659ac865d71287ff6a',
 
   'src/third_party/dart/third_party/pkg/test_reflective_loader':
    Var('dart_git') + '/test_reflective_loader.git' + '@' + Var('dart_test_reflective_loader_tag'),

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 593a03c2f5ae4c190dddf0f58b87d95e
+Signature: 00efa64a22b3ce9ad58311846e38c643
 
 UNUSED LICENSES:
 
@@ -8054,6 +8054,18 @@ FILE: ../../../third_party/dart/benchmarks/Utf8Decode/dart2/netext_3_10k.dart
 FILE: ../../../third_party/dart/benchmarks/Utf8Decode/dart2/rutext_2_10k.dart
 FILE: ../../../third_party/dart/benchmarks/Utf8Decode/dart2/sktext_10k.dart
 FILE: ../../../third_party/dart/benchmarks/Utf8Decode/dart2/zhtext_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/datext_latin1_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/entext_ascii_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/netext_3_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/rutext_2_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/sktext_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/zhtext_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/datext_latin1_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/entext_ascii_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/netext_3_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/rutext_2_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/sktext_10k.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/zhtext_10k.dart
 FILE: ../../../third_party/dart/client/idea/.idea/.name
 FILE: ../../../third_party/dart/client/idea/.idea/inspectionProfiles/Project_Default.xml
 FILE: ../../../third_party/dart/client/idea/.idea/vcs.xml
@@ -8381,6 +8393,8 @@ FILE: ../../../third_party/dart/benchmarks/TypedDataDuplicate/dart/TypedDataDupl
 FILE: ../../../third_party/dart/benchmarks/TypedDataDuplicate/dart2/TypedDataDuplicate.dart
 FILE: ../../../third_party/dart/benchmarks/Utf8Decode/dart/Utf8Decode.dart
 FILE: ../../../third_party/dart/benchmarks/Utf8Decode/dart2/Utf8Decode.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart/Utf8Encode.dart
+FILE: ../../../third_party/dart/benchmarks/Utf8Encode/dart2/Utf8Encode.dart
 FILE: ../../../third_party/dart/runtime/bin/dartdev_isolate.cc
 FILE: ../../../third_party/dart/runtime/bin/dartdev_isolate.h
 FILE: ../../../third_party/dart/runtime/bin/exe_utils.cc