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

fpdfsdk/include/jsapi/fxjs_v8.h

Index: fpdfsdk/include/jsapi/fxjs_v8.h
diff --git a/fpdfsdk/include/jsapi/fxjs_v8.h b/fpdfsdk/include/jsapi/fxjs_v8.h
index f4f9d4685208c99aab89ad4628f23c9884b8f839..d3cd4ebe6e4a24f820e2a0180f7c018fd5db976f 100644
--- a/fpdfsdk/include/jsapi/fxjs_v8.h
+++ b/fpdfsdk/include/jsapi/fxjs_v8.h
@@ -78,6 +78,9 @@ void FXJS_Release();
 // created.
 bool FXJS_GetIsolate(v8::Isolate** pResultIsolate);
 
+// Get the global isolate's ref count.
+size_t FXJS_GlobalIsolateRefCount();
+
 // Call before making FXJS_Define* calls. Resources allocated here are cleared
 // as part of FXJS_ReleaseRuntime().
 void FXJS_PrepareIsolate(v8::Isolate* pIsolate);