Add field to monitor last visited time for each search engine

components/search_engines/default_search_manager.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/default_search_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 52 matching lines @@
 const char DefaultSearchManager::kInstantURLPostParams[] =
     "instant_url_post_params";
 const char DefaultSearchManager::kImageURLPostParams[] =
     "image_url_post_params";
 
 const char DefaultSearchManager::kSafeForAutoReplace[] = "safe_for_autoreplace";
 const char DefaultSearchManager::kInputEncodings[] = "input_encodings";
 
 const char DefaultSearchManager::kDateCreated[] = "date_created";
 const char DefaultSearchManager::kLastModified[] = "last_modified";
+const char DefaultSearchManager::kLastVisited[] = "last_visited";
 
 const char DefaultSearchManager::kUsageCount[] = "usage_count";
 const char DefaultSearchManager::kAlternateURLs[] = "alternate_urls";
 const char DefaultSearchManager::kSearchTermsReplacementKey[] =
     "search_terms_replacement_key";
 const char DefaultSearchManager::kCreatedByPolicy[] = "created_by_policy";
 const char DefaultSearchManager::kDisabledByPolicy[] = "disabled_by_policy";
 
 DefaultSearchManager::DefaultSearchManager(
     PrefService* pref_service,
@@ skipping 71 matching lines @@
 }
 
 void DefaultSearchManager::SetUserSelectedDefaultSearchEngine(
     const TemplateURLData& data) {
   if (!pref_service_) {
     prefs_default_search_.reset(new TemplateURLData(data));
     MergePrefsDataWithPrepopulated();
     NotifyObserver();
     return;
   }
+
   pref_service_->Set(kDefaultSearchProviderDataPrefName,
                      *TemplateURLDataToDictionary(data));
 }
 
 void DefaultSearchManager::SetExtensionControlledDefaultSearchEngine(
     const TemplateURLData& data) {
   extension_default_search_.reset(new TemplateURLData(data));
   if (GetDefaultSearchEngineSource() == FROM_EXTENSION)
     NotifyObserver();
 }
@@ skipping 51 matching lines @@
 
     if (!prefs_default_search_->safe_for_autoreplace) {
       engine->safe_for_autoreplace = false;
       engine->SetKeyword(prefs_default_search_->keyword());
       engine->SetShortName(prefs_default_search_->short_name());
     }
     engine->id = prefs_default_search_->id;
     engine->sync_guid = prefs_default_search_->sync_guid;
     engine->date_created = prefs_default_search_->date_created;
     engine->last_modified = prefs_default_search_->last_modified;
+    engine->last_visited = prefs_default_search_->last_visited;
 
     prefs_default_search_ = std::move(engine);
     return;
   }
 }
 
 void DefaultSearchManager::LoadDefaultSearchEngineFromPrefs() {
   if (!pref_service_)
     return;
 
@@ skipping 30 matching lines @@
   MergePrefsDataWithPrepopulated();
 }
 
 void DefaultSearchManager::NotifyObserver() {
   if (!change_observer_.is_null()) {
     Source source = FROM_FALLBACK;
     TemplateURLData* data = GetDefaultSearchEngine(&source);
     change_observer_.Run(data, source);
   }
 }