Support globs in $include and $exclude.

sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_prefix_test.dart

Index: sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_prefix_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_list_test.dart b/sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_prefix_test.dart
similarity index 79%
copy from sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_list_test.dart
copy to sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_prefix_test.dart
index 52930390aa482a2a4bb397613e4bdffb877da832..6e2cfaca0da2e8a90bc4addf3e2b6393e3831da7 100644
--- a/sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_list_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/exclusion/exclude_asset_prefix_test.dart
@@ -11,17 +11,14 @@ import '../../serve/utils.dart';
 main() {
   initConfig();
   withBarbackVersions("any", () {
-    integration("excludes a list of assets", () {
+    integration("allows a directory prefix to exclude", () {
       d.dir(appPath, [
         d.pubspec({
           "name": "myapp",
           "transformers": [
             {
               "myapp/src/transformer": {
-                "\$exclude": [
-                  "web/foo.txt",
-                  "web/sub/foo.txt"
-                ]
+                "\$exclude": "web/sub"
               }
             }
           ]
@@ -34,6 +31,9 @@ main() {
           d.file("bar.txt", "bar"),
           d.dir("sub", [
             d.file("foo.txt", "foo"),
+          ]),
+          d.dir("subbub", [
+            d.file("foo.txt", "foo"),
           ])
         ])
       ]).create();
@@ -41,9 +41,10 @@ main() {
       createLockFile('myapp', pkg: ['barback']);
 
       pubServe();
-      requestShould404("foo.out");
-      requestShould404("sub/foo.out");
+      requestShouldSucceed("foo.out", "foo.out");
       requestShouldSucceed("bar.out", "bar.out");
+      requestShouldSucceed("subbub/foo.out", "foo.out");
+      requestShould404("sub/foo.out");
       endPubServe();
     });
   });