Precompile dependencies' executables for use with "pub run".

sdk/lib/_internal/pub/test/snapshot/upgrades_snapshot_test.dart

+// 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.
+
+library pub_tests;
+
+import 'package:path/path.dart' as p;
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+main() {
+  initConfig();
+  integration("upgrades a snapshot when its package is upgraded", () {
+    servePackages([packageMap("foo", "1.2.3")], contents: [
+      d.dir("bin", [
+        d.file("hello.dart", "void main() => print('hello!');")
+      ])
+    ]);
+
+    d.appDir({"foo": "any"}).create();
+
+    pubGet(output: contains("Precompiled foo:hello."));
+
+    d.dir(p.join(appPath, '.pub', 'bin', 'foo'), [
+      d.matcherFile('hello.dart.snapshot', contains('hello!'))
+    ]).validate();
+
+    servePackages([packageMap("foo", "1.2.4")], contents: [
+      d.dir("bin", [
+        d.file("hello.dart", "void main() => print('hello 2!');")
+      ])
+    ]);
+
+    pubUpgrade(output: contains("Precompiled foo:hello."));
+
+    d.dir(p.join(appPath, '.pub', 'bin', 'foo'), [
+      d.matcherFile('hello.dart.snapshot', contains('hello 2!'))
+    ]).validate();
+
+    var process = pubRun(args: ['foo:hello']);
+    process.stdout.expect("hello 2!");
+    process.shouldExit();
+  });
+}