Support activating packages from local paths.

sdk/lib/_internal/pub/test/global/activate/activate_hosted_after_path_test.dart

Index: sdk/lib/_internal/pub/test/global/activate/activate_hosted_after_path_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/activate/activate_hosted_after_path_test.dart b/sdk/lib/_internal/pub/test/global/activate/activate_hosted_after_path_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6dec06bdceb5dfd636b4f1cc5f213ea873742562
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/global/activate/activate_hosted_after_path_test.dart
@@ -0,0 +1,43 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:path/path.dart' as p;
+
+import '../../../lib/src/io.dart';
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration('activating a hosted package deactivates the path one', () {
+    servePackages([
+      packageMap("foo", "2.0.0")
+    ], contents: [
+      d.dir("bin", [
+        d.file("foo.dart", "main(args) => print('hosted');")
+      ])
+    ]);
+
+    d.dir("foo", [
+      d.libPubspec("foo", "1.0.0"),
+      d.dir("bin", [
+        d.file("foo.dart", "main() => print('path');")
+      ])
+    ]).create();
+
+    schedulePub(args: ["global", "activate", "-spath", "../foo"]);
+
+    var path = canonicalize(p.join(sandboxDir, "foo"));
+    schedulePub(args: ["global", "activate", "foo"], output: """
+        Package foo is currently active at path "$path".
+        Downloading foo 2.0.0...
+        Resolving dependencies...
+        Activated foo 2.0.0.""");
+
+    // Should now run the hosted one.
+    var pub = pubRun(global: true, args: ["foo"]);
+    pub.stdout.expect("hosted");
+    pub.shouldExit();
+  });
+}