Revert 184837

chrome/renderer/extensions/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_NATIVE_HANDLER_H_
 #define CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_
 
+#include "base/bind.h"
+#include "base/memory/linked_ptr.h"
 #include "v8/include/v8.h"
 
+#include <string>
+#include <vector>
+
 namespace extensions {
 
+// A NativeHandler 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.
+//
 // NativeHandlers are intended to be used with a ModuleSystem. The ModuleSystem
 // will assume ownership of the NativeHandler, and as a ModuleSystem is tied to
 // a single v8::Context, this implies that NativeHandlers will also be tied to
-// a single v8::Context.
+// a single v8::context.
 // TODO(koz): Rename this to NativeJavaScriptModule.
 class NativeHandler {
  public:
-  virtual ~NativeHandler() {}
+  explicit NativeHandler(v8::Isolate* isolate);
+  virtual ~NativeHandler();
 
-  // Create a new instance of the object this handler specifies.
-  virtual v8::Handle<v8::Object> NewInstance() = 0;
+  // Create an object with bindings to the native functions defined through
+  // RouteFunction().
+  virtual v8::Handle<v8::Object> NewInstance();
+
+ protected:
+  typedef v8::Handle<v8::Value> (*HandlerFunc)(const v8::Arguments&);
+  typedef base::Callback<v8::Handle<v8::Value>(const v8::Arguments&)>
+      HandlerFunction;
+
+  // Installs a new 'route' from |name| to |handler_function|. This means that
+  // NewInstance()s of this NativeHandler will have a property |name| which
+  // will be handled by |handler_function|.
+  void RouteFunction(const std::string& name,
+                     const HandlerFunction& handler_function);
+
+  void RouteStaticFunction(const std::string& name,
+                           const HandlerFunc handler_func);
+
+ private:
+  static v8::Handle<v8::Value> Router(const v8::Arguments& args);
+
+  std::vector<linked_ptr<HandlerFunction> > handler_functions_;
+  v8::Isolate* isolate_;
+  v8::Persistent<v8::ObjectTemplate> object_template_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeHandler);
 };
 
 }  // extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_