Enable CSP by default for extensions with manifest_version >= 2.

chrome/common/extensions/extension.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_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 476 matching lines @@
 
   const FilePath& path() const { return path_; }
   const GURL& url() const { return extension_url_; }
   Location location() const { return location_; }
   const std::string& id() const { return id_; }
   const Version* version() const { return version_.get(); }
   const std::string VersionString() const;
   const std::string& name() const { return name_; }
   const std::string& public_key() const { return public_key_; }
   const std::string& description() const { return description_; }
+  int manifest_version() const { return manifest_version_; }
   bool converted_from_user_script() const {
     return converted_from_user_script_;
   }
   const UserScriptList& content_scripts() const { return content_scripts_; }
   ExtensionAction* page_action() const { return page_action_.get(); }
   ExtensionAction* browser_action() const { return browser_action_.get(); }
   ExtensionSidebarDefaults* sidebar_defaults() const {
     return sidebar_defaults_.get();
   }
   const FileBrowserHandlerList* file_browser_handlers() const {
@@ skipping 200 matching lines @@
 
   // The extension's human-readable name. Name is used for display purpose. It
   // might be wrapped with unicode bidi control characters so that it is
   // displayed correctly in RTL context.
   // NOTE: Name is UTF-8 and may contain non-ascii characters.
   std::string name_;
 
   // The absolute path to the directory the extension is stored in.
   FilePath path_;
 
+  // The version of this extension's manifest. We increase the manifest
+  // version when making breaking changes to the extension system.
+  // Version 1 was the first manifest version (implied by a lack of a
+  // manifest_version attribute in the extension's manifest). We initialize
+  // this member variable to 0 to distinguish the "uninitialized" case from
+  // the case when we know the manifest version actually is 1.
+  int manifest_version_;
+
   // Default locale for fall back. Can be empty if extension is not localized.
   std::string default_locale_;
 
   // If true, a separate process will be used for the extension in incognito
   // mode.
   bool incognito_split_mode_;
 
   // Whether the extension or app should be enabled when offline.
   bool offline_enabled_;
 
@@ skipping 204 matching lines @@
   // only contain the removed permissions.
   const ExtensionPermissionSet* permissions;
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const ExtensionPermissionSet* permissions,
       Reason reason);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_