Provide an array buffer allocator to V8.

fpdfsdk/include/javascript/JS_Runtime.h

Index: fpdfsdk/include/javascript/JS_Runtime.h
diff --git a/fpdfsdk/include/javascript/JS_Runtime.h b/fpdfsdk/include/javascript/JS_Runtime.h
index a1f62b8d0fa175c98bd144809e3aed167e4e1e2d..5326db693dec45b3e9d22ef977d5f59c880d7d3e 100644
--- a/fpdfsdk/include/javascript/JS_Runtime.h
+++ b/fpdfsdk/include/javascript/JS_Runtime.h
@@ -7,6 +7,7 @@
 #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"
@@ -14,6 +15,12 @@
 
 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:
@@ -53,15 +60,16 @@ public:
 
 	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_