Bring back initPolymer, allow boot.js only if using "polymer_experimental.html".

pkg/polymer/e2e_test/canonicalization/test/dir/dev1_test.dart

Index: pkg/polymer/e2e_test/canonicalization/test/dir/dev1_test.dart
diff --git a/pkg/polymer/example/canonicalization/lib/c.dart b/pkg/polymer/e2e_test/canonicalization/test/dir/dev1_test.dart
similarity index 62%
rename from pkg/polymer/example/canonicalization/lib/c.dart
rename to pkg/polymer/e2e_test/canonicalization/test/dir/dev1_test.dart
index 362f3e3d642f2e8c969c79de78dcc51bb95c3803..ed64858b1e28c9fc1064d2d357255cb273c6e71a 100644
--- a/pkg/polymer/example/canonicalization/lib/c.dart
+++ b/pkg/polymer/e2e_test/canonicalization/test/dir/dev1_test.dart
@@ -2,6 +2,6 @@
 // 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 canonicalization.c;
-
-int c = 0;
+/// Tests canonicalization at deployment time from a subdir.
+library canonicalization.test.dir.dev1_test;
+export 'dev_common.dart';