Implement the Extension History API, v 0.1....

chrome/common/extensions/extension.h

 // Copyright (c) 2009 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_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 59 matching lines @@
   static const int kPageActionIconMaxSize;
   static const int kBrowserActionIconMaxSize;
 
   // Each permission is a module that the extension is permitted to use.
   static const char* kTabPermission;
   static const char* kBookmarkPermission;
 
   static const char* kPermissionNames[];
   static const size_t kNumPermissions;
 
+  // Experimental extension APIs are guarded by the following flag.
+  static const char* kExperimentalName;
+
   struct PrivacyBlacklistInfo {
     FilePath path;  // Path to the plain-text blacklist.
   };
 
   // An NPAPI plugin included in the extension.
   struct PluginInfo {
     FilePath path;  // Path to the plugin.
     bool is_public;  // False if only this extension can load this plugin.
   };
 
@@ skipping 302 matching lines @@
 
   // True if the background page is ready.
   bool background_page_ready_;
 
   FRIEND_TEST(ExtensionTest, LoadPageActionHelper);
 
   DISALLOW_COPY_AND_ASSIGN(Extension);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_