First pass at experimental omnibox API. There are plenty of rough edges and

chrome/common/extensions/extension.h

 // Copyright (c) 2010 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 309 matching lines @@
     return manifest_value_.get();
   }
 
   const std::string default_locale() const { return default_locale_; }
 
   // Chrome URL overrides (see ExtensionOverrideUI).
   const URLOverrideMap& GetChromeURLOverrides() const {
     return chrome_url_overrides_;
   }
 
+  const std::string omnibox_keyword() const { return omnibox_keyword_; }
+
   bool web_content_enabled() const { return web_content_enabled_; }
   const ExtensionExtent& web_extent() const { return web_extent_; }
 
   const std::string& launch_local_path() const { return launch_local_path_; }
   const std::string& launch_web_url() const { return launch_web_url_; }
   LaunchContainer launch_container() const { return launch_container_; }
   bool launch_fullscreen() const { return launch_fullscreen_; }
 
   // Gets the fully resolved absolute launch URL.
   GURL GetFullLaunchURL() const;
@@ skipping 181 matching lines @@
   // The type of container to launch into.
   LaunchContainer launch_container_;
 
   // Launch full screen by default.
   bool launch_fullscreen_;
 
   // Cached images for this extension. This maps from the relative_path of the
   // resource to the cached image.
   ImageCache image_cache_;
 
+  // The omnibox keyword for this extension, or empty if there is none.
+  std::string omnibox_keyword_;
+
   // Runtime data:
 
   // True if the background page is ready.
   bool background_page_ready_;
 
   // True while the extension is being upgraded.
   bool being_upgraded_;
 
   FRIEND_TEST(ExtensionTest, LoadPageActionHelper);
   FRIEND_TEST(TabStripModelTest, Apps);
@@ skipping 20 matching lines @@
   scoped_ptr<DictionaryValue> extension_manifest;
   std::string extension_id;
   FilePath extension_path;
   Extension::Location extension_location;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionInfo);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_