add flavor-conditional asset bundling support to `flutter test` (#140944)

Fixes https://github.com/flutter/flutter/issues/140932
https://dart.googlesource.com/external/github.com/flutter/flutter/+/8c11aa030d45ce74959cef064a06f2581ffcc95d

DEPS

diff --git a/DEPS b/DEPS
index 22cdf59..c4bc4a2 100644
--- a/DEPS
+++ b/DEPS
@@ -274,7 +274,7 @@
 
   'engine/src/third_party/dart': Var('dart_git') + '/sdk' + '@' + 'e5cbde13b92bbfeec815dcdf8bf40a246e651be0',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '1a8de105cf2d629e9fb4ad7fc065b121e1000055',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '8c11aa030d45ce74959cef064a06f2581ffcc95d',
 
   'engine/src/flutter/third_party/rapidjson':
    Var('flutter_git') + '/third_party/rapidjson' + '@' + 'ef3564c5c8824989393b87df25355baf35ff544b',

commits.json

diff --git a/commits.json b/commits.json
index f57ae34..64ac45e 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"4440feaa3ecd18ff82dccfc65f5b53374e2126d4",
   "engine/src/third_party/dart":"e5cbde13b92bbfeec815dcdf8bf40a246e651be0",
-  "flutter":"1a8de105cf2d629e9fb4ad7fc065b121e1000055"
+  "flutter":"8c11aa030d45ce74959cef064a06f2581ffcc95d"
 }
\ No newline at end of file