Support activating packages from local paths.

sdk/lib/_internal/pub/test/global/run/runs_path_script_test.dart

Index: sdk/lib/_internal/pub/test/global/run/runs_path_script_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/run/runs_script_test.dart b/sdk/lib/_internal/pub/test/global/run/runs_path_script_test.dart
similarity index 56%
copy from sdk/lib/_internal/pub/test/global/run/runs_script_test.dart
copy to sdk/lib/_internal/pub/test/global/run/runs_path_script_test.dart
index caf8f42d0e6637bc708dd6681b3cb62835995e67..b8d9b2c2645215fb066761c0f5aa50988deb0542 100644
--- a/sdk/lib/_internal/pub/test/global/run/runs_script_test.dart
+++ b/sdk/lib/_internal/pub/test/global/run/runs_path_script_test.dart
@@ -7,18 +7,17 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('runs a script in an activated package', () {
-    servePackages([
-      packageMap("foo", "1.0.0")
-    ], contents: [
+  integration('runs a script in a path package', () {
+    d.dir("foo", [
+      d.libPubspec("foo", "1.0.0"),
       d.dir("bin", [
-        d.file("script.dart", "main(args) => print('ok');")
+        d.file("foo.dart", "main() => print('ok');")
       ])
-    ]);
+    ]).create();
 
-    schedulePub(args: ["global", "activate", "foo"]);
+    schedulePub(args: ["global", "activate", "--source", "path", "../foo"]);
 
-    var pub = pubRun(global: true, args: ["foo:script"]);
+    var pub = pubRun(global: true, args: ["foo"]);
     pub.stdout.expect("ok");
     pub.shouldExit();
   });