Omnibox: Call Stop() on all Providers After Certain Amount of Time

chrome/browser/autocomplete/autocomplete_controller.h

 // Copyright (c) 2012 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_CONTROLLER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ skipping 161 matching lines @@
   // stats.
   void UpdateAssistedQueryStats(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();
 
-  // Starts the expire timer.
+  // Starts |expire_timer_|.
   void StartExpireTimer();
 
+  // Starts |stop_timer_|.
+  void StartStopTimer();
+
   AutocompleteControllerDelegate* delegate_;
 
   // A list of all providers.
   ACProviders providers_;
 
   HistoryURLProvider* history_url_provider_;
 
   KeywordProvider* keyword_provider_;
 
   SearchProvider* search_provider_;
@@ skipping 15 matching lines @@
   // also be more recent than the last keystroke if there was an
   // asynchronous provider that returned and changed the default
   // match.  See UpdateResult() for details on when we consider a
   // match to have changed.
   base::TimeTicks last_time_default_match_changed_;
 
   // Timer used to remove any matches copied from the last result. When run
   // invokes |ExpireCopiedEntries|.
   base::OneShotTimer<AutocompleteController> expire_timer_;
 
+  // Timer used to tell the providers to Stop() searching for matches.
+  base::OneShotTimer<AutocompleteController> stop_timer_;
+
+  // True if the user is in the "stop timer" field trial.  If so, the
+  // controller uses the |stop_timer_|.
+  const bool in_stop_timer_field_trial_;
+
   // True if a query is not currently running.
   bool done_;
 
   // Are we in Start()? This is used to avoid updating |result_| and sending
   // notifications until Start() has been invoked on all providers.
   bool in_start_;
 
   // Has StartZeroSuggest() been called but not Start()?
   bool in_zero_suggest_;
 
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteController);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CONTROLLER_H_