Merge XFA to PDFium master at 4dc95e7 on 10/28/2014
diff --git a/fpdfsdk/src/javascript/JS_Context.cpp b/fpdfsdk/src/javascript/JS_Context.cpp
index a83e1e0..31969e4 100644
--- a/fpdfsdk/src/javascript/JS_Context.cpp
+++ b/fpdfsdk/src/javascript/JS_Context.cpp
@@ -107,6 +107,7 @@
 FX_BOOL CJS_Context::RunScript(const CFX_WideString& script, CFX_WideString& info)
 {
 	v8::Isolate::Scope isolate_scope(m_pRuntime->GetIsolate());
+	v8::Locker locker(m_pRuntime->GetIsolate());
 	v8::HandleScope handle_scope(m_pRuntime->GetIsolate());
 	v8::Local<v8::Context> context = m_pRuntime->NewJSContext();
 	v8::Context::Scope context_scope(context);