Fine. Support for extensions in ManifestElementKind.

Change-Id: Ia097086e6af98d963f534dd6e5999f76cbe4a2a2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/444501
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>

https://dart.googlesource.com/sdk/+/15805da8a45891de9d4f130d9710b531b78fe562

DEPS

diff --git a/DEPS b/DEPS
index 9b5bf12..2300217 100644
--- a/DEPS
+++ b/DEPS
@@ -229,7 +229,7 @@
 ]
 
 deps = {
-  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + 'f610946497b23c03d9dca9ba1bd734bc7c708254',
+  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '15805da8a45891de9d4f130d9710b531b78fe562',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'a54369e089f2d34eab1bc186f448fec4d16ff419',
 

commits.json

diff --git a/commits.json b/commits.json
index cb477d4..fdafb3a 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
   "flutter":"a54369e089f2d34eab1bc186f448fec4d16ff419",
-  "flutter/engine/src/flutter/third_party/dart":"f610946497b23c03d9dca9ba1bd734bc7c708254"
+  "flutter/engine/src/flutter/third_party/dart":"15805da8a45891de9d4f130d9710b531b78fe562"
 }
\ No newline at end of file