Add dart:html and friends to patched_dart2js_sdk/platform.dill, also fix up

tools/dom/src/EventStreamProvider.dart

Index: tools/dom/src/EventStreamProvider.dart
diff --git a/tools/dom/src/EventStreamProvider.dart b/tools/dom/src/EventStreamProvider.dart
index 3fd6be8e7c07b63b522b6475e60de4a21c290ae3..7989689d1bdfb2d6ebbdee0f312cc114fd61379d 100644
--- a/tools/dom/src/EventStreamProvider.dart
+++ b/tools/dom/src/EventStreamProvider.dart
@@ -298,9 +298,9 @@ class _EventStreamSubscription<T extends Event> extends StreamSubscription<T> {
     }
   }
 
-  Future/*<E>*/ asFuture/*<E>*/([var/*=E*/ futureValue]) {
+  Future<E> asFuture<E>([E futureValue]) {
     // We just need a future that will never succeed or fail.
-    var completer = new Completer/*<E>*/();
+    var completer = new Completer<E>();
     return completer.future;
   }
 }