Parse ThisExpression with Fasta.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

Index: pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
index fb2421a4b64328364516a7e5716c52cca0bdf065..ecccca2aa22929acaa3d0323fdc3709e9fb4eec9 100644
--- a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
+++ b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
@@ -444,6 +444,11 @@ class AstBuilder extends ScopeListener {
     push(ast.symbolLiteral(toAnalyzerToken(hashToken), components));
   }
 
+  void handleThisExpression(Token token) {
+    debugEvent("ThisExpression");
+    push(ast.thisExpression(toAnalyzerToken(token)));
+  }
+
   void handleType(Token beginToken, Token endToken) {
     debugEvent("Type");
     TypeArgumentList arguments = pop();