Updated build files for Fuchsia.

pkg/typed_mock/BUILD.gn

Index: pkg/typed_mock/BUILD.gn
diff --git a/utils/analysis_server/BUILD.gn b/pkg/typed_mock/BUILD.gn
similarity index 62%
copy from utils/analysis_server/BUILD.gn
copy to pkg/typed_mock/BUILD.gn
index 767c81fcdd0edd4cbde66cf088693e6b5de6107c..b00e00bb871d0d4c7b80073aa112abd5cb638c08 100644
--- a/utils/analysis_server/BUILD.gn
+++ b/pkg/typed_mock/BUILD.gn
@@ -2,8 +2,10 @@
 # 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("../invoke_dart.gni")
+import("//build/dart/dart_package.gni")
 
-application_snapshot("analysis_server") {
-  main_dart = "../../pkg/analysis_server/bin/server.dart"
+dart_package("typed_mock") {
+  package_name = "typed_mock"
+
+  source_dir = "lib"
 }