Parse script tags with Fasta.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index 9c2e8ef4720b7020f3ea8275b90df82dfe6aef09..afcabb0fc779ff76d2fb69b8955a7aab78951566 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -812,6 +812,11 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
   }
 
   @override
+  void handleScript(Token token) {
+    debugEvent("Script");
+  }
+
+  @override
   void handleStringJuxtaposition(int literalCount) {
     debugEvent("StringJuxtaposition");
     List<Expression> parts = popListForValue(literalCount);