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

chrome/renderer/resources/extension_process_bindings.js

 // 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.
 
 // This script contains privileged chrome extension related javascript APIs.
 // It is loaded by pages whose URL has the chrome-extension protocol.
 
 var chrome = chrome || {};
 (function() {
   native function GetExtensionAPIDefinition();
@@ skipping 287 matching lines @@
       }
 
       var parentMenuItemId = arguments[0].parentMenuItemId;
       var parentOnclick = chromeHidden.contextMenuHandlers[parentMenuItemId];
       if (parentOnclick) {
         parentOnclick.apply(parentOnclick, arguments);
       }
     });
   }
 
+  function setupOmniboxEvents(extensionId) {
+    chrome.experimental.omnibox.onInputEntered =
+        new chrome.Event("experimental.omnibox.onInputEntered/" + extensionId);
+
+    chrome.experimental.omnibox.onInputChanged =
+        new chrome.Event("experimental.omnibox.onInputChanged/" + extensionId);
+    chrome.experimental.omnibox.onInputChanged.dispatch =
+        function(text, requestId) {
+      var suggestCallback = function(suggestions) {
+        chrome.experimental.omnibox.sendSuggestions(requestId, suggestions);
+      }
+      chrome.Event.prototype.dispatch.apply(this, [text, suggestCallback]);
+    };
+  }
+
   chromeHidden.onLoad.addListener(function (extensionId) {
     chrome.initExtension(extensionId, false);
 
     // |apiFunctions| is a hash of name -> object that stores the
     // name & definition of the apiFunction. Custom handling of api functions
     // is implemented by adding a "handleRequest" function to the object.
     var apiFunctions = {};
 
     // Read api definitions and setup api functions in the chrome namespace.
     // TODO(rafaelw): Consider defining a json schema for an api definition
@@ skipping 311 matching lines @@
 
     if (chrome.test) {
       chrome.test.getApiDefinitions = GetExtensionAPIDefinition;
     }
 
     setupBrowserActionEvent(extensionId);
     setupPageActionEvents(extensionId);
     setupToolstripEvents(GetRenderViewId());
     setupPopupEvents(GetRenderViewId());
     setupHiddenContextMenuEvent(extensionId);
+    setupOmniboxEvents(extensionId);
   });
 
   if (!chrome.experimental)
     chrome.experimental = {};
 
   if (!chrome.experimental.accessibility)
     chrome.experimental.accessibility = {};
 })();