Add root types and thread id to root visiting.

Enables us to pass the root type and thread id to hprof.

Bug: 12680863
Change-Id: I6a0f1f9e3aa8f9b4033d695818ae7ca3460d67cb
diff --git a/runtime/mirror/stack_trace_element.h b/runtime/mirror/stack_trace_element.h
index 73d2673..51817f6 100644
--- a/runtime/mirror/stack_trace_element.h
+++ b/runtime/mirror/stack_trace_element.h
@@ -57,7 +57,7 @@
 
   static void SetClass(Class* java_lang_StackTraceElement);
   static void ResetClass();
-  static void VisitRoots(RootVisitor* visitor, void* arg)
+  static void VisitRoots(RootCallback* callback, void* arg)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
  private: