Make lazy and declaring transformers work with $include/$exclude.

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

Index: sdk/lib/_internal/pub/test/transformer/exclusion/works_on_lazy_transformer_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/exclusion/works_on_transformer_group_test.dart b/sdk/lib/_internal/pub/test/transformer/exclusion/works_on_lazy_transformer_test.dart
similarity index 52%
copy from sdk/lib/_internal/pub/test/transformer/exclusion/works_on_transformer_group_test.dart
copy to sdk/lib/_internal/pub/test/transformer/exclusion/works_on_lazy_transformer_test.dart
index d18fd56dd413b3cc9156e7539b19491a240a2a80..deef7a0360758a8c240bb1515439305bf29a4614 100644
--- a/sdk/lib/_internal/pub/test/transformer/exclusion/works_on_transformer_group_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/exclusion/works_on_lazy_transformer_test.dart
@@ -4,53 +4,49 @@
 
 library pub_tests;
 
+import 'package:scheduled_test/scheduled_stream.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../../serve/utils.dart';
 
-const GROUP = """
-import 'package:barback/barback.dart';
-
-import 'transformer.dart';
-
-class RewriteGroup implements TransformerGroup {
-  RewriteGroup.asPlugin();
-
-  Iterable<Iterable> get phases => [[new RewriteTransformer.asPlugin()]];
-}
-""";
-
 main() {
   initConfig();
-  integration("works on a transformer group", () {
+  integration("works on a lazy transformer", () {
     d.dir(appPath, [
       d.pubspec({
         "name": "myapp",
         "transformers": [
           {
-            "myapp/src/group": {
+            "myapp": {
               "\$include": ["web/a.txt", "web/b.txt"],
               "\$exclude": "web/a.txt"
             }
           }
         ]
       }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", REWRITE_TRANSFORMER),
-        d.file("group.dart", GROUP)
-      ])]),
+      d.dir("lib", [d.file("transformer.dart", LAZY_TRANSFORMER)]),
       d.dir("web", [
-        d.file("a.txt", "a.txt"),
-        d.file("b.txt", "b.txt"),
-        d.file("c.txt", "c.txt")
+        d.file("a.txt", "a"),
+        d.file("b.txt", "b"),
+        d.file("c.txt", "c")
       ])
     ]).create();
 
     createLockFile('myapp', pkg: ['barback']);
 
-    pubServe();
+    var server = pubServe();
+    // The transformer should remain lazy.
+    server.stdout.expect("Build completed successfully");
+
     requestShould404("a.out");
-    requestShouldSucceed("b.out", "b.txt.out");
+    requestShouldSucceed("b.out", isNot(isEmpty));
+    server.stdout.expect(consumeThrough(emitsLines(
+        "[Info from LazyRewrite]:\n"
+        "Rewriting myapp|web/b.txt.")));
+    server.stdout.expect(consumeThrough("Build completed successfully"));
+
     requestShould404("c.out");
     endPubServe();
   });