Only call DefineJSObjects() once for the global V8 isolate.

fpdfsdk/src/jsapi/fxjs_v8.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../include/jsapi/fxjs_v8.h"
 
 #include "../../../core/include/fxcrt/fx_basic.h"
 
@@ skipping 148 matching lines @@
   }
   // Provide backwards compatibility when no external isolate.
   if (!g_arrayBufferAllocator)
     g_arrayBufferAllocator = new FXJS_ArrayBufferAllocator();
   v8::Isolate::CreateParams params;
   params.array_buffer_allocator = g_arrayBufferAllocator;
   *pResultIsolate = v8::Isolate::New(params);
   return true;
 }
 
+size_t FXJS_GlobalIsolateRefCount() {
+  return g_isolate_ref_count;
+}
+
 // static
 void FXJS_PerIsolateData::SetUp(v8::Isolate* pIsolate) {
   if (!pIsolate->GetData(g_embedderDataSlot))
     pIsolate->SetData(g_embedderDataSlot, new FXJS_PerIsolateData());
 }
 
 // static
 FXJS_PerIsolateData* FXJS_PerIsolateData::Get(v8::Isolate* pIsolate) {
   return static_cast<FXJS_PerIsolateData*>(
       pIsolate->GetData(g_embedderDataSlot));
@@ skipping 598 matching lines @@
     return v8::Local<v8::Array>();
   v8::Local<v8::Context> context = pIsolate->GetCurrentContext();
   return v8::Local<v8::Array>::Cast(pValue->ToObject(context).ToLocalChecked());
 }
 
 void FXJS_ValueCopy(v8::Local<v8::Value>& pTo, v8::Local<v8::Value> pFrom) {
   pTo = pFrom;
 }