DevTools: CPUProfiler: provide url for scripts that have sourceURL property.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 123fdc5adf4de5d691ba3bcdcf1ab28c3fc7810b..41030de48e4fb3945411990b852d3b9e5c44c11f 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -597,6 +597,9 @@ v8::Handle<v8::Array> GetKeysForIndexedInterceptor(Handle<JSReceiver> receiver,
 
 Handle<Object> GetScriptNameOrSourceURL(Handle<Script> script) {
   Isolate* isolate = script->GetIsolate();
+  if (!isolate->IsInitialized()) {
+    return isolate->factory()->undefined_value();
+  }
   Handle<String> name_or_source_url_key =
       isolate->factory()->InternalizeOneByteString(
           STATIC_ASCII_VECTOR("nameOrSourceURL"));