Parametrize Suggest polling strategy and delay. Also add a parameter

components/omnibox/search_provider.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.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all autocomplete entries that start with "Search <engine>
 // for ...", including searching for the current input string, search
 // history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 
@@ skipping 183 matching lines @@
   // if suggested relevances cause undesirable behavior. Updates |done_|.
   void UpdateMatches();
 
   // Called when timer_ expires.
   void Run();
 
   // Runs the history query, if necessary. The history query is synchronous.
   // This does not update |done_|.
   void DoHistoryQuery(bool minimal_changes);
 
+  // Returns the time to delay before sending the Suggest request.
+  base::TimeDelta GetSuggestQueryDelay() const;
+
   // Determines whether an asynchronous subcomponent query should run for the
   // current input.  If so, starts it if necessary; otherwise stops it.
   // NOTE: This function does not update |done_|.  Callers must do so.
   void StartOrStopSuggestQuery(bool minimal_changes);
 
   // Returns true when the current query can be sent to the Suggest service.
   // This will be false e.g. when Suggest is disabled, the query contains
   // potentially private data, etc.
   bool IsQuerySuitableForSuggest() const;
 
@@ skipping 120 matching lines @@
 
   // Obtains a session token, regenerating if necessary.
   std::string GetSessionToken();
 
   // Answers prefetch handling - finds the previously displayed answer matching
   // the current top-scoring history result. If there is a previous answer,
   // returns the query data associated with it. Otherwise, returns an empty
   // AnswersQueryData.
   AnswersQueryData FindAnswersPrefetchData();
 
-  // The amount of time to wait before sending a new suggest request after the
-  // previous one.  Non-const because some unittests modify this value.
-  static int kMinimumTimeBetweenSuggestQueriesMs;
-
   AutocompleteProviderListener* listener_;
 
   // The number of suggest results that haven't yet arrived. If it's greater
   // than 0, it indicates that one of the URLFetchers is still running.
   int suggest_results_pending_;
 
   // Maintains the TemplateURLs used.
   Providers providers_;
 
   // The user's input.
@@ skipping 38 matching lines @@
   base::TimeTicks token_expiration_time_;
 
   // Answers prefetch management.
   AnswersCache answers_cache_;  // Cache for last answers seen.
   AnswersQueryData prefetch_data_;  // Data to use for query prefetching.
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // COMPONENTS_OMNIBOX_SEARCH_PROVIDER_H_