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

chrome/browser/search_engines/template_url_model.h

Index: chrome/browser/search_engines/template_url_model.h
diff --git a/chrome/browser/search_engines/template_url_model.h b/chrome/browser/search_engines/template_url_model.h
index 5b7623402a75c4b2207edca77f8f6864c4926e1e..8bab7cb61c7e368b4c0563b5f05aa0767eb045f3 100644
--- a/chrome/browser/search_engines/template_url_model.h
+++ b/chrome/browser/search_engines/template_url_model.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -13,6 +13,7 @@
 #include "chrome/common/notification_registrar.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
+class Extension;
 class PrefService;
 class Profile;
 
@@ -136,6 +137,20 @@ class TemplateURLModel : public WebDataServiceConsumer,
   // date passed in.
   void RemoveAutoGeneratedSince(base::Time created_after);
 
+  // If the given extension has an omnibox keyword, adds a TemplateURL for that
+  // keyword. Only 1 keyword is allowed for a given extension. If the keyword
+  // already exists for this extension, does nothing.
+  void RegisterExtensionKeyword(Extension* extension);
+
+  // Removes the TemplateURL containing the keyword for the given extension,
+  // if any.
+  void UnregisterExtensionKeyword(Extension* extension);
+
+  // Returns the TemplateURL associated with the keyword for this extension.
+  // This works by checking the extension ID, not the keyword, so it will work
+  // even if the user changed the keyword.
+  const TemplateURL* GetTemplateURLForExtension(Extension* extension) const;
+
   // Returns the set of URLs describing the keywords. The elements are owned
   // by TemplateURLModel and should not be deleted.
   std::vector<const TemplateURL*> GetTemplateURLs() const;
@@ -186,6 +201,12 @@ class TemplateURLModel : public WebDataServiceConsumer,
   // number changes.
   void RemoveDuplicatePrepopulateIDs(std::vector<const TemplateURL*>* urls);
 
+  // Returns the locale-direction-adjusted short name for the given keyword.
+  // Also sets the out param to indicate whether the keyword belongs to an
+  // extension.
+  std::wstring GetKeywordShortName(const std::wstring& keyword,
+                                   bool* is_extension_keyword);
+
   // NotificationObserver method. TemplateURLModel listens for three
   // notification types:
   // . NOTIFY_HISTORY_URL_VISITED: adds keyword search terms if the visit
@@ -351,6 +372,9 @@ class TemplateURLModel : public WebDataServiceConsumer,
   // increasing integer that is initialized from the database.
   TemplateURL::IDType next_id_;
 
+  // List of extension IDs waiting for Load to have keywords registered.
+  std::vector<std::string> pending_extension_ids_;
+
   DISALLOW_EVIL_CONSTRUCTORS(TemplateURLModel);
 };