Get real result for batch exacution.

compiler/java/com/google/dart/compiler/DartCompiler.java

Index: compiler/java/com/google/dart/compiler/DartCompiler.java
diff --git a/compiler/java/com/google/dart/compiler/DartCompiler.java b/compiler/java/com/google/dart/compiler/DartCompiler.java
index 1d0eb2852d10b0bc68bdac262869ef47d33dd6c3..a7f44e64202515bbe8842513ef71f3b5ed19e53f 100644
--- a/compiler/java/com/google/dart/compiler/DartCompiler.java
+++ b/compiler/java/com/google/dart/compiler/DartCompiler.java
@@ -1008,7 +1008,7 @@ public class DartCompiler {
         if (topArgs.length > 1) {
           System.err.println("(Extra arguments specified with -batch ignored.)");
         }
-        UnitTestBatchRunner.runAsBatch(topArgs, new Invocation() {
+        result = UnitTestBatchRunner.runAsBatch(topArgs, new Invocation() {
           @Override
           public boolean invoke(String[] lineArgs) throws Throwable {
             List<String> allArgs = new ArrayList<String>();