Enabled pressing TAB to cycle through the Omnibox results.

chrome/browser/autocomplete/autocomplete.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_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 656 matching lines @@
   // Removes any entries that were copied from the last result. This is used by
   // the popup to ensure it's not showing an out-of-date query.
   void ExpireCopiedEntries();
 
 #ifdef UNIT_TEST
   void set_search_provider(SearchProvider* provider) {
     search_provider_ = provider;
   }
 #endif
   SearchProvider* search_provider() const { return search_provider_; }
+  KeywordProvider* keyword_provider() const { return keyword_provider_; }
 
   // Getters
   const AutocompleteInput& input() const { return input_; }
   const AutocompleteResult& result() const { return result_; }
   bool done() const { return done_; }
 
   // From AutocompleteProvider::Listener
   virtual void OnProviderUpdate(bool updated_matches);
 
  private:
   // Updates |result_| to reflect the current provider state.  Resets timers and
   // fires notifications as necessary.  |is_synchronous_pass| is true only when
   // Start() is calling this to get the synchronous result.
   void UpdateResult(bool is_synchronous_pass);
 
+  // Updates |result_| to populate each match's |associated_keyword| if that
+  // match can show a keyword hint.  |result_| should be sorted by
+  // relevance before this is called.
+  void PopulateMatchKeywordHints();
+
   // For each group of contiguous matches from the same TemplateURL, show the
   // provider name as a description on the first match in the group.
   void UpdateKeywordDescriptions(AutocompleteResult* result);
 
   // Calls AutocompleteControllerDelegate::OnResultChanged() and if done sends
   // AUTOCOMPLETE_CONTROLLER_RESULT_READY.
   void NotifyChanged(bool notify_default_match);
 
   // Updates |done_| to be accurate with respect to current providers' statuses.
   void CheckIfDone();
@@ skipping 54 matching lines @@
   AutocompleteInput::Type input_type;
   // Selected index (if selected) or -1 (AutocompletePopupModel::kNoMatch).
   size_t selected_index;
   // Inline autocompleted length (if displayed).
   size_t inline_autocompleted_length;
   // Result set.
   const AutocompleteResult& result;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_H_