Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/lib/src/validator/license.dart

Index: sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/validator/license.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8d19d541e83ad8c5b7f946d6b5fccc93e5f6233e
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/license.dart
@@ -0,0 +1,23 @@
+library pub.validator.license;
+import 'dart:async';
+import 'package:path/path.dart' as path;
+import '../entrypoint.dart';
+import '../io.dart';
+import '../utils.dart';
+import '../validator.dart';
+class LicenseValidator extends Validator {
+  LicenseValidator(Entrypoint entrypoint) : super(entrypoint);
+  Future validate() {
+    return syncFuture(() {
+      var licenseLike =
+          new RegExp(r"^([a-zA-Z0-9]+[-_])?(LICENSE|COPYING)(\..*)?$");
+      if (listDir(
+          entrypoint.root.dir).map(path.basename).any(licenseLike.hasMatch)) {
+        return;
+      }
+      errors.add(
+          "You must have a COPYING or LICENSE file in the root directory.\n"
+              "An open-source license helps ensure people can legally use your " "code.");
+    });
+  }
+}