Replace bootstrap logic with 'boot.js', use 'component/dart' mime-type and add

samples/third_party/todomvc/test/markdone_test.dart

Index: samples/third_party/todomvc/test/markdone_test.dart
diff --git a/samples/third_party/todomvc/test/markdone_test.dart b/samples/third_party/todomvc/test/markdone_test.dart
index 1622a438557bc7d84a44afa9f00663920e922f8e..f6dd283a3b56659545912bbb01f09ace6d97609a 100644
--- a/samples/third_party/todomvc/test/markdone_test.dart
+++ b/samples/third_party/todomvc/test/markdone_test.dart
@@ -32,8 +32,8 @@ Node findWithText(Node node, String text) {
  * This test runs the TodoMVC app, adds a few todos, marks some as done
  * programatically, and clicks on a checkbox to mark others via the UI.
  */
+@initMethod
 main() {
-  initPolymer();
   useHtmlConfiguration();
 
   TodoModel model;