Provide an array buffer allocator to V8.

fpdfsdk/include/javascript/JS_Runtime.h

 // 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
 
 #ifndef _JS_RUNTIME_H_
 #define _JS_RUNTIME_H_
 
+#include "../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../../core/include/fxcrt/fx_basic.h"
 #include "../jsapi/fxjs_v8.h"
 #include "IJavaScript.h"
 #include "JS_EventHandler.h"
 
 class CJS_Context;
 
+class CJS_ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
+    void* Allocate(size_t length) override;
+    void* AllocateUninitialized(size_t length) override;
+    void Free(void* data, size_t length) override;
+};
+
 class CJS_FieldEvent
 {
 public:
         CFX_WideString          sTargetName;
         JS_EVENT_T                      eEventType;
         CJS_FieldEvent*         pNext;
 };
 
 class CJS_Runtime : public IFXJS_Runtime
 {
@@ skipping 19 matching lines @@
         void                                                                    BeginBlock(){m_bBlocking = TRUE;}
         void                                                                    EndBlock(){m_bBlocking = FALSE;}
         FX_BOOL                                                                 IsBlocking(){return m_bBlocking;}
 
         operator                                                                IJS_Runtime*() {return (IJS_Runtime*)m_isolate;}
         v8::Isolate*                                                            GetIsolate(){return m_isolate;};
         void                                                                    SetIsolate(v8::Isolate* isolate){m_isolate = isolate;}
 
         v8::Handle<v8::Context>                                                 NewJSContext();
 protected:
-        CFX_ArrayTemplate<CJS_Context *>                m_ContextArray;
-        CPDFDoc_Environment *                                                   m_pApp;
-        CPDFSDK_Document *                                              m_pDocument;
+        CFX_ArrayTemplate<CJS_Context*>         m_ContextArray;
+        CPDFDoc_Environment*                                                    m_pApp;
+        CPDFSDK_Document*                                               m_pDocument;
         FX_BOOL                                                                 m_bBlocking;
+        FX_BOOL                                                                 m_bRegistered;
         CJS_FieldEvent*                                                 m_pFieldEventPath;
 
-        v8::Isolate*                                                            m_isolate;
-        v8::Persistent<v8::Context>                                             m_context;
-        FX_BOOL                                                                 m_bRegistered;
+        v8::Isolate* m_isolate;
+        nonstd::unique_ptr<CJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
+        v8::Persistent<v8::Context> m_context;
 };
 
 #endif //_JS_RUNTIME_H_