Add type parameters to methods in typed-data patch.

runtime/lib/typed_data_patch.dart

Index: runtime/lib/typed_data_patch.dart
diff --git a/runtime/lib/typed_data_patch.dart b/runtime/lib/typed_data_patch.dart
index 4a0dd3e3af81334e85477ab84442e497efcc4c09..c3df4d4711a1b6e8ce36ab05b45faadec13f78f3 100644
--- a/runtime/lib/typed_data_patch.dart
+++ b/runtime/lib/typed_data_patch.dart
@@ -59,8 +59,7 @@ abstract class _TypedListBase {
     return value;
   }
 
-  dynamic fold(
-      dynamic initialValue, dynamic combine(dynamic initialValue, element)) {
+  T fold<T>(T initialValue, T combine(T initialValue, element)) {
     var len = this.length;
     for (var i = 0; i < len; ++i) {
       initialValue = combine(initialValue, this[i]);
@@ -68,9 +67,10 @@ abstract class _TypedListBase {
     return initialValue;
   }
 
-  Iterable map(f(element)) => new MappedIterable(this, f);
+  Iterable<T> map<T>(T f(element)) => new MappedIterable<dynamic, T>(this, f);
 
-  Iterable expand(Iterable f(element)) => new ExpandIterable(this, f);
+  Iterable<T> expand<T>(Iterable<T> f(element)) =>
+      new ExpandIterable<dynamic, T>(this, f);
 
   bool every(bool f(element)) {
     var len = this.length;