Revert 186643 - Caused a 10% regression on SunSpider benchmark

chrome/renderer/extensions/native_handler.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "chrome/renderer/extensions/native_handler.h"
 
+#include "base/memory/linked_ptr.h"
+#include "base/logging.h"
+#include "chrome/renderer/extensions/module_system.h"
+#include "v8/include/v8.h"
+
 namespace extensions {
 
-NativeHandler::NativeHandler() : is_valid_(true) {}
-
-NativeHandler::~NativeHandler() {}
-
-void NativeHandler::Invalidate() {
-  is_valid_ = false;
+NativeHandler::NativeHandler(v8::Isolate* isolate)
+    : isolate_(isolate),
+      object_template_(
+          v8::Persistent<v8::ObjectTemplate>::New(isolate,
+                                                  v8::ObjectTemplate::New())) {
 }
 
-}  // namespace extensions
+NativeHandler::~NativeHandler() {
+  object_template_.Dispose(isolate_);
+}
+
+v8::Handle<v8::Object> NativeHandler::NewInstance() {
+  return object_template_->NewInstance();
+}
+
+// static
+v8::Handle<v8::Value> NativeHandler::Router(const v8::Arguments& args) {
+  // It is possible for JS code to execute after ModuleSystem has been deleted
+  // in which case the native handlers will also have been deleted, making
+  // HandlerFunction below point to freed memory.
+  if (!ModuleSystem::IsPresentInCurrentContext()) {
+    return v8::ThrowException(v8::Exception::Error(
+        v8::String::New("ModuleSystem has been deleted")));
+  }
+  HandlerFunction* handler_function = static_cast<HandlerFunction*>(
+      args.Data().As<v8::External>()->Value());
+  return handler_function->Run(args);
+}
+
+void NativeHandler::RouteFunction(const std::string& name,
+    const HandlerFunction& handler_function) {
+  linked_ptr<HandlerFunction> function(new HandlerFunction(handler_function));
+  // TODO(koz): Investigate using v8's MakeWeak() function instead of holding
+  // on to these pointers here.
+  handler_functions_.push_back(function);
+  v8::Handle<v8::FunctionTemplate> function_template =
+      v8::FunctionTemplate::New(Router,
+          v8::External::New(function.get()));
+  object_template_->Set(name.c_str(), function_template);
+}
+
+void NativeHandler::RouteStaticFunction(const std::string& name,
+                                        const HandlerFunc handler_func) {
+  v8::Handle<v8::FunctionTemplate> function_template =
+      v8::FunctionTemplate::New(handler_func, v8::External::New(this));
+  object_template_->Set(name.c_str(), function_template);
+}
+
+}   // extensions