Merge to XFA: Only call DefineJSObjects() once for the global V8 isolate.

fpdfsdk/src/jsapi/fxjs_v8.cpp

Index: fpdfsdk/src/jsapi/fxjs_v8.cpp
diff --git a/fpdfsdk/src/jsapi/fxjs_v8.cpp b/fpdfsdk/src/jsapi/fxjs_v8.cpp
index eae1bb414a4adff6f3b0462b2db8e6f38a36695b..80def30f96a2f95373b540895d3452e6a5ae9158 100644
--- a/fpdfsdk/src/jsapi/fxjs_v8.cpp
+++ b/fpdfsdk/src/jsapi/fxjs_v8.cpp
@@ -158,6 +158,10 @@ bool FXJS_GetIsolate(v8::Isolate** pResultIsolate) {
   return true;
 }
 
+size_t FXJS_GlobalIsolateRefCount() {
+  return g_isolate_ref_count;
+}
+
 // static
 void FXJS_PerIsolateData::SetUp(v8::Isolate* pIsolate) {
   if (!pIsolate->GetData(g_embedderDataSlot))