Wrote functions to convert collections and maps to strings and invoked

runtime/lib/byte_array.dart

Index: runtime/lib/byte_array.dart
===================================================================
--- runtime/lib/byte_array.dart	(revision 4412)
+++ runtime/lib/byte_array.dart	(working copy)
@@ -141,6 +141,10 @@
     return this[length - 1];
   }
 
+  String toString() {
+    return Collections.collectionToString(this);
+  }
+
   void setRange(int start, int length, List<int> from, [int startFrom = 0]) {
     if (length < 0) {
       throw new IllegalArgumentException("negative length $length");