Correctly recover from incorrect imports, etc.

pkg/front_end/lib/src/fasta/parser/listener.dart

Index: pkg/front_end/lib/src/fasta/parser/listener.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/listener.dart b/pkg/front_end/lib/src/fasta/parser/listener.dart
index 70f7096a201b89a4a37d248e7ff38b0e2871d29b..3c6c2365179399396962f6d2da3f7582e1bc2201 100644
--- a/pkg/front_end/lib/src/fasta/parser/listener.dart
+++ b/pkg/front_end/lib/src/fasta/parser/listener.dart
@@ -152,6 +152,12 @@ class Listener {
 
   void beginExpressionStatement(Token token) {}
 
+  /// Called by [ClassMemberParser] after skipping an expression as error
+  /// recovery.
+  void handleRecoverExpression(Token token) {
+    logEvent("RecoverExpression");
+  }
+
   void endExpressionStatement(Token token) {
     logEvent("ExpressionStatement");
   }