- Add possibility to redirect messages if they were not delivered.

runtime/vm/message.cc

Index: runtime/vm/message.cc
===================================================================
--- runtime/vm/message.cc	(revision 36729)
+++ runtime/vm/message.cc	(working copy)
@@ -4,8 +4,20 @@
 
 #include "vm/message.h"
 
+#include "vm/port.h"
+
 namespace dart {
 
+bool Message::RedirectToDeliveryFailurePort() {
+  if (delivery_failure_port_ == kIllegalPort) {
+    return false;
+  }
+  dest_port_ = delivery_failure_port_;
+  delivery_failure_port_ = kIllegalPort;
+  return true;
+}
+
+
 MessageQueue::MessageQueue() {
   head_ = NULL;
   tail_ = NULL;
@@ -59,7 +71,11 @@
   tail_ = NULL;
   while (cur != NULL) {
     Message* next = cur->next_;
-    delete cur;
+    if (cur->RedirectToDeliveryFailurePort()) {
+      PortMap::PostMessage(cur);
+    } else {
+      delete cur;
+    }
     cur = next;
   }
 }