Patches to support Dart VM patch files in dart2js.

pkg/compiler/lib/src/parser/listener.dart

Index: pkg/compiler/lib/src/parser/listener.dart
diff --git a/pkg/compiler/lib/src/parser/listener.dart b/pkg/compiler/lib/src/parser/listener.dart
index e1e4c3c557d223e72d0013b9a4019e7350661c1f..f24a453b171ed57afe18cefc8eaa4ceb20259c43 100644
--- a/pkg/compiler/lib/src/parser/listener.dart
+++ b/pkg/compiler/lib/src/parser/listener.dart
@@ -441,6 +441,13 @@ class Listener {
     return synthesizedToken;
   }
 
+  Token synthesizeString(Token token) {
+    Token synthesizedToken = new StringToken.fromString(
+        Precedence.STRING_INFO, '?', token.charOffset);
+    synthesizedToken.next = token.next;
+    return synthesizedToken;
+  }
+
   Token expectedIdentifier(Token token) {
     if (token is ErrorToken) {
       reportErrorToken(token);
@@ -450,6 +457,15 @@ class Listener {
     return skipToEof(token);
   }
 
+  Token expectedString(Token token) {
+    if (token is ErrorToken) {
+      reportErrorToken(token);
+    } else {
+      error("expected string, but got '${token.value}'", token);
+    }
+    return skipToEof(token);
+  }
+
   Token expectedType(Token token) {
     if (token is ErrorToken) {
       reportErrorToken(token);