Make v8 embedder data slot configurable

fpdfsdk/src/javascript/JS_Runtime.cpp

Index: fpdfsdk/src/javascript/JS_Runtime.cpp
diff --git a/fpdfsdk/src/javascript/JS_Runtime.cpp b/fpdfsdk/src/javascript/JS_Runtime.cpp
index b26f5a2e6211b8081a07fe3cd82127d5c2b39a8f..f21819ac17424cc80bb88dbf6899769bb756e6d0 100644
--- a/fpdfsdk/src/javascript/JS_Runtime.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime.cpp
@@ -35,7 +35,11 @@ IFXJS_Runtime*					CJS_RuntimeFactory::NewJSRuntime(CPDFDoc_Environment* pApp)
 {
 	if (!m_bInit)
 	{
-		JS_Initial();
+		unsigned int embedderDataSlot = 0;
+		if (pApp->GetFormFillInfo()->m_pJsPlatform->version >= 2) {
+			embedderDataSlot = pApp->GetFormFillInfo()->m_pJsPlatform->m_v8EmbedderSlot;
+                }
+		JS_Initial(embedderDataSlot);
 		m_bInit = TRUE;
 	}
 	return new CJS_Runtime(pApp);