Add js api for hosted/pacakged apps to request notification authorization

chrome/renderer/extensions/callback_map.h

+// Copyright (c) 2011 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_CALLBACK_MAP_H_
+#define CHROME_RENDERER_EXTENSIONS_CALLBACK_MAP_H_
+#pragma once
+
+#include <map>
+
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "v8/include/v8.h"
+
+namespace extensions_v8_util {

[Aaron Boodman, 2011/10/03 22:07:43]

This isn't specific to extensions - can you just put it in renderer/ instead?
Call it something like WeakV8FunctionMap or something?

[asargent_no_longer_on_chrome, 2011/10/04 00:43:20]

Done.

+
+// Callback functions are kept track of in maps keyed by an integer. Values are
+// weak references to functions. Entries are automatically removed when
+// functions get garbage collected.
+class CallbackMap {
+ public:
+  CallbackMap();
+  ~CallbackMap();
+
+  // Adds |callback_function| to the map under |key|. The entry will be removed
+  // from the map when the function is about to be GCed.
+  void Add(int key, v8::Local<v8::Function> callback_function);
+
+  // Removes and returns a entry from the map for |key|. If there was no entry
+  // for |key|, the return value will return true for IsEmpty().
+  v8::Persistent<v8::Function> Remove(int key);
+
+ private:
+  typedef std::map<int, v8::Persistent<v8::Function> > Map;
+  Map map_;
+  base::WeakPtrFactory<CallbackMap> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(CallbackMap);
+};
+
+}  // namespace extensions_v8_util
+
+#endif  // CHROME_RENDERER_EXTENSIONS_CALLBACK_MAP_H_