Parse factory constructors with Fasta.

pkg/analyzer/lib/src/summary/fasta/summary_builder.dart

Index: pkg/analyzer/lib/src/summary/fasta/summary_builder.dart
diff --git a/pkg/analyzer/lib/src/summary/fasta/summary_builder.dart b/pkg/analyzer/lib/src/summary/fasta/summary_builder.dart
index 58da040a05b637e0ad763ab14924c2d0f2502ce5..33b217ed92ac5a10b44ef306c88e7df47cb43e09 100644
--- a/pkg/analyzer/lib/src/summary/fasta/summary_builder.dart
+++ b/pkg/analyzer/lib/src/summary/fasta/summary_builder.dart
@@ -984,7 +984,8 @@ class SummaryBuilder extends StackListener {
     checkEmpty();
   }
 
-  void endFactoryMethod(Token beginToken, Token endToken) {
+  void endFactoryMethod(
+      Token beginToken, Token factoryKeyword, Token endToken) {
     debugEvent("FactoryMethod");
     throw new UnimplementedError(); // TODO(paulberry)
     // pop(); // async-modifiers