Refactor fxjs_v8 and add embeddertests for it.

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 FPDFSDK_INCLUDE_JAVASCRIPT_JS_RUNTIME_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_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 {
  public:
-  CJS_Runtime(CPDFDoc_Environment* pApp);
+  explicit CJS_Runtime(CPDFDoc_Environment* pApp);
   ~CJS_Runtime() override;
 
   // IFXJS_Runtime
   IFXJS_Context* NewContext() override;
   void ReleaseContext(IFXJS_Context* pContext) override;
   IFXJS_Context* GetCurrentContext() override;
   void SetReaderDocument(CPDFSDK_Document* pReaderDoc) override;
   CPDFSDK_Document* GetReaderDocument() override { return m_pDocument; }
 
   CPDFDoc_Environment* GetReaderApp() const { return m_pApp; }
@@ skipping 14 matching lines @@
  private:
   void DefineJSObjects();
 
   CFX_ArrayTemplate<CJS_Context*> m_ContextArray;
   CPDFDoc_Environment* m_pApp;
   CPDFSDK_Document* m_pDocument;
   FX_BOOL m_bBlocking;
   CJS_FieldEvent* m_pFieldEventPath;
   v8::Isolate* m_isolate;
   bool m_isolateManaged;
-  nonstd::unique_ptr<CJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
+  nonstd::unique_ptr<JS_ArrayBufferAllocator> m_pArrayBufferAllocator;
   v8::Global<v8::Context> m_context;
 };
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_JS_RUNTIME_H_