Revert of Make the CPDFXFA_App non-global

fxjs/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 "fxjs/fxjs_v8.h"
 
 #include <vector>
 
@@ skipping 215 matching lines @@
   m_V8PersistentContext.Reset();
 }
 
 // static
 CFXJS_Engine* CFXJS_Engine::CurrentEngineFromIsolate(v8::Isolate* pIsolate) {
   return static_cast<CFXJS_Engine*>(
       pIsolate->GetCurrentContext()->GetAlignedPointerFromEmbedderData(
           kPerContextDataIndex));
 }
 
+#ifdef PDF_ENABLE_XFA
+// static
+void CFXJS_Engine::SetForV8Context(v8::Local<v8::Context> v8Context,
+                                   CFXJS_Engine* pEngine) {
+  v8Context->SetAlignedPointerInEmbedderData(kPerContextDataIndex, pEngine);
+}
+#endif  // PDF_ENABLE_XFA
+
 // static
 int CFXJS_Engine::GetObjDefnID(v8::Local<v8::Object> pObj) {
   if (pObj.IsEmpty() || !pObj->InternalFieldCount())
     return -1;
   CFXJS_PerObjectData* pPerObjectData = static_cast<CFXJS_PerObjectData*>(
       pObj->GetAlignedPointerFromInternalField(0));
   if (!pPerObjectData)
     return -1;
   return pPerObjectData->m_ObjDefID;
 }
@@ skipping 536 matching lines @@
 }
 
 void CFXJS_Engine::SetConstArray(const CFX_WideString& name,
                                  v8::Local<v8::Array> array) {
   m_ConstArrays[name] = v8::Global<v8::Array>(GetIsolate(), array);
 }
 
 v8::Local<v8::Array> CFXJS_Engine::GetConstArray(const CFX_WideString& name) {
   return v8::Local<v8::Array>::New(GetIsolate(), m_ConstArrays[name]);
 }