[Android] Sort custom search engines based on last visited time and display only top 3 most recentl…

components/search_engines/template_url_service.cc

 // Copyright 2014 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.
 
 #include "components/search_engines/template_url_service.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 593 matching lines @@
 }
 
 void TemplateURLService::ResetTemplateURL(TemplateURL* url,
                                           const base::string16& title,
                                           const base::string16& keyword,
                                           const std::string& search_url) {
   if (ResetTemplateURLNoNotify(url, title, keyword, search_url))
     NotifyObservers();
 }
 
+void TemplateURLService::UpdateTemplateURLVisitTime(TemplateURL* url) {
+  TemplateURLData data(url->data());
+  data.last_visited = clock_->Now();
+  Update(url, TemplateURL(data));
+}
+
+
 bool TemplateURLService::CanMakeDefault(const TemplateURL* url) {
   return
       ((default_search_provider_source_ == DefaultSearchManager::FROM_USER) ||
        (default_search_provider_source_ ==
         DefaultSearchManager::FROM_FALLBACK)) &&
       (url != GetDefaultSearchProvider()) &&
       url->url_ref().SupportsReplacement(search_terms_data()) &&
       (url->type() == TemplateURL::NORMAL);
 }
 
@@ skipping 99 matching lines @@
     DefaultSearchManager::Source source;
     const TemplateURLData* new_dse =
         default_search_manager_.GetDefaultSearchEngine(&source);
     // ApplyDefaultSearchChange will notify observers once it is done.
     ApplyDefaultSearchChange(new_dse, source);
   } else {
     NotifyObservers();
   }
 }
 
-void TemplateURLService::UpdateTemplateURLVisitTime(TemplateURL* url) {
-  TemplateURLData data(url->data());
-  data.last_visited = clock_->Now();
-  Update(url, TemplateURL(data));
-}
-
 void TemplateURLService::AddObserver(TemplateURLServiceObserver* observer) {
   model_observers_.AddObserver(observer);
 }
 
 void TemplateURLService::RemoveObserver(TemplateURLServiceObserver* observer) {
   model_observers_.RemoveObserver(observer);
 }
 
 void TemplateURLService::Load() {
   if (loaded_ || load_handle_ || disable_load_)
@@ skipping 1747 matching lines @@
 
   if (most_recently_intalled_default) {
     base::AutoReset<DefaultSearchChangeOrigin> change_origin(
         &dsp_change_origin_, DSP_CHANGE_OVERRIDE_SETTINGS_EXTENSION);
     default_search_manager_.SetExtensionControlledDefaultSearchEngine(
         most_recently_intalled_default->data());
   } else {
     default_search_manager_.ClearExtensionControlledDefaultSearchEngine();
   }
 }