Fix for cascade sections SourceInfo

compiler/java/com/google/dart/compiler/parser/DartParser.java

Index: compiler/java/com/google/dart/compiler/parser/DartParser.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartParser.java b/compiler/java/com/google/dart/compiler/parser/DartParser.java
index adde09b6321bef279ed323f34d68ae3e42fee0b2..42a5ca52864e65c48c88d75d6a6f68ecfb21d7a2 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartParser.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartParser.java
@@ -2302,7 +2302,9 @@ public class DartParser extends CompletionHooksParserBase {
     if (token == Token.CASCADE) {
       List<DartExpression> cascadeSections = new ArrayList<DartExpression>();
       while (token == Token.CASCADE) {
+        beginExpression();
         DartExpression section = parseCascadeSection();
+        done(section);
         if (section != null) {
           cascadeSections.add(section);
         }