Move most of ChromeV8Context to a base ScriptContext

chrome/renderer/extensions/object_backed_native_handler.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_RENDERER_EXTENSIONS_OBJECT_BACKED_NATIVE_HANDLER_H_
-#define CHROME_RENDERER_EXTENSIONS_OBJECT_BACKED_NATIVE_HANDLER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/bind.h"
-#include "base/memory/linked_ptr.h"
-#include "extensions/renderer/native_handler.h"
-#include "extensions/renderer/scoped_persistent.h"
-#include "v8/include/v8-util.h"
-#include "v8/include/v8.h"
-
-namespace extensions {
-class ChromeV8Context;
-
-// An ObjectBackedNativeHandler is a factory for JS objects with functions on
-// them that map to native C++ functions. Subclasses should call RouteFunction()
-// in their constructor to define functions on the created JS objects.
-class ObjectBackedNativeHandler : public NativeHandler {
- public:
-  explicit ObjectBackedNativeHandler(ChromeV8Context* context);
-  virtual ~ObjectBackedNativeHandler();
-
-  // Create an object with bindings to the native functions defined through
-  // RouteFunction().
-  virtual v8::Handle<v8::Object> NewInstance() OVERRIDE;
-
-  v8::Isolate* GetIsolate() const;
-
- protected:
-  typedef base::Callback<void(const v8::FunctionCallbackInfo<v8::Value>&)>
-      HandlerFunction;
-
-  // Installs a new 'route' from |name| to |handler_function|. This means that
-  // NewInstance()s of this ObjectBackedNativeHandler will have a property
-  // |name| which will be handled by |handler_function|.
-  void RouteFunction(const std::string& name,
-                     const HandlerFunction& handler_function);
-
-  ChromeV8Context* context() const { return context_; }
-
-  virtual void Invalidate() OVERRIDE;
-
- private:
-  // Callback for RouteFunction which routes the V8 call to the correct
-  // base::Bound callback.
-  static void Router(const v8::FunctionCallbackInfo<v8::Value>& args);
-
-  // When RouteFunction is called we create a v8::Object to hold the data we
-  // need when handling it in Router() - this is the base::Bound function to
-  // route to.
-  //
-  // We need a v8::Object because it's possible for v8 to outlive the
-  // base::Bound function; the lifetime of an ObjectBackedNativeHandler is the
-  // lifetime of webkit's involvement with it, not the life of the v8 context.
-  // A scenario when v8 will outlive us is if a frame holds onto the
-  // contentWindow of an iframe after it's removed.
-  //
-  // So, we use v8::Objects here to hold that data, effectively refcounting
-  // the data. When |this| is destroyed we remove the base::Bound function from
-  // the object to indicate that it shoudn't be called.
-  typedef v8::PersistentValueVector<v8::Object> RouterData;
-  RouterData router_data_;
-
-  ChromeV8Context* context_;
-
-  ScopedPersistent<v8::ObjectTemplate> object_template_;
-
-  DISALLOW_COPY_AND_ASSIGN(ObjectBackedNativeHandler);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_RENDERER_EXTENSIONS_OBJECT_BACKED_NATIVE_HANDLER_H_