Create a mechanism define declarative rules via the extension manifest.

extensions/common/manifest_constants.cc

 // Copyright 2013 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 "extensions/common/manifest_constants.h"
 
 namespace extensions {
 
 namespace manifest_keys {
 
@@ skipping 26 matching lines @@
 const char kDefaultLocale[] = "default_locale";
 const char kDescription[] = "description";
 const char kDevToolsPage[] = "devtools_page";
 const char kDisplayInLauncher[] = "display_in_launcher";
 const char kDisplayInNewTabPage[] = "display_in_new_tab_page";
 const char kEventName[] = "event_name";
 const char kExcludeGlobs[] = "exclude_globs";
 const char kExcludeMatches[] = "exclude_matches";
 const char kExport[] = "export";
 const char kExternallyConnectable[] = "externally_connectable";
+const char kEventRules[] = "event_rules";
 const char kFileAccessList[] = "file_access";
 const char kFileFilters[] = "file_filters";
 const char kFileBrowserHandlers[] = "file_browser_handlers";
 const char kFileHandlers[] = "file_handlers";
 const char kFileHandlerExtensions[] = "extensions";
 const char kFileHandlerTypes[] = "types";
 const char kGlobal[] = "global";
 const char kHideBookmarkButton[] = "hide_bookmark_button";
 const char kHomepageURL[] = "homepage_url";
 const char kIcons[] = "icons";
@@ skipping 662 matching lines @@
     "'file_system_provider_capabilities' section to be specified in the "
     "manifest.";
 const char kInvalidFileSystemProviderMissingPermission[] =
     "The 'file_system_provider_capabilities' section requires the "
     "'fileSystemProvider' permission to be specified in the manifest.";
 #endif
 
 }  // namespace manifest_errors
 
 }  // namespace extensions