Add an API to control the disposal of external string resources...

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 4799)
+++ src/api.cc	(working copy)
@@ -3692,6 +3692,14 @@
 }
 
 
+void V8::SetExternalStringDiposeCallback(
+    ExternalStringDiposeCallback callback) {
+  if (IsDeadCheck("v8::V8::SetExternalStringDiposeCallback()"))
+    return;
+  i::Heap::SetExternalStringDiposeCallback(callback);
+}
+
+
 void V8::SetCounterFunction(CounterLookupCallback callback) {
   if (IsDeadCheck("v8::V8::SetCounterFunction()")) return;
   i::StatsTable::SetCounterFunction(callback);