Push v8::Isolate into CFXJS_Engine class

fpdfsdk/javascript/JS_Runtime_Stub.cpp

 // Copyright 2015 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 <memory>
 
 #include "fpdfsdk/include/fsdk_mgr.h"
 #include "fpdfsdk/javascript/ijs_context.h"
@@ skipping 129 matching lines @@
 #ifdef PDF_ENABLE_XFA
   FX_BOOL GetValueByName(const CFX_ByteStringC&, CFXJSE_Value*) override {
     return FALSE;
   }
 
   FX_BOOL SetValueByName(const CFX_ByteStringC&, CFXJSE_Value*) override {
     return FALSE;
   }
 #endif  // PDF_ENABLE_XFA
 
-  int Execute(const CFX_WideString& script, CFX_WideString* info) override {
+  int ExecuteScript(const CFX_WideString& script,
+                    CFX_WideString* info) override {
     return 0;
   }
 
  protected:
   CPDFSDK_Document* m_pDoc;
   std::unique_ptr<CJS_ContextStub> m_pContext;
 };
 
 // static
 void IJS_Runtime::Initialize(unsigned int slot, void* isolate) {}
 
 // static
 void IJS_Runtime::Destroy() {}
 
 // static
 IJS_Runtime* IJS_Runtime::Create(CPDFDoc_Environment* pEnv) {
   return new CJS_RuntimeStub;
 }