Add v8::Message::GetScriptOrigin() with tests

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index ab4ded2472971ea519ba412b40c16bfc39804ad1..1e043bf3c5cf452ec21633c4549ec79768a8130a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1937,6 +1937,22 @@ v8::Handle<Value> Message::GetScriptResourceName() const {
 }
 
 
+v8::Handle<Value> Message::GetScriptResourceNameOrSourceURL() const {
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ENTER_V8(isolate);
+  EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
+  i::Handle<i::JSMessageObject> message =
+      i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
+
+  i::Handle<i::JSValue> scriptValue =
+      i::Handle<i::JSValue>::cast(i::Handle<i::Object>(message->script(),
+                                                       isolate));
+  i::Handle<i::Script> script(i::Script::cast(scriptValue->value()));
+  i::Handle<i::Object> script_name = i::Script::GetNameOrSourceURL(script);
+  return scope.Escape(Utils::ToLocal(script_name));
+}
+
+
 v8::Handle<v8::StackTrace> Message::GetStackTrace() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ENTER_V8(isolate);