Make extensions DSE persistent in browser prefs

chrome/browser/search_engines/chrome_template_url_service_client.h

Index: chrome/browser/search_engines/chrome_template_url_service_client.h
diff --git a/chrome/browser/search_engines/chrome_template_url_service_client.h b/chrome/browser/search_engines/chrome_template_url_service_client.h
index de0bfbfeed9078b80507a05822d796ac038dbeeb..1b6f044d19d43e579587c5b6edf553b60f6527d6 100644
--- a/chrome/browser/search_engines/chrome_template_url_service_client.h
+++ b/chrome/browser/search_engines/chrome_template_url_service_client.h
@@ -14,13 +14,16 @@ namespace history {
 class HistoryService;
 }
 
+class ExtensionPrefValueMap;
+
 // ChromeTemplateURLServiceClient provides keyword related history
 // functionality for TemplateURLService.
 class ChromeTemplateURLServiceClient : public TemplateURLServiceClient,
                                        public history::HistoryServiceObserver {
  public:
-  explicit ChromeTemplateURLServiceClient(
-      history::HistoryService* history_service);
+  ChromeTemplateURLServiceClient(
+      history::HistoryService* history_service,
+      ExtensionPrefValueMap* extension_prefs_value_map);
   ~ChromeTemplateURLServiceClient() override;
 
   // TemplateURLServiceClient:
@@ -32,6 +35,7 @@ class ChromeTemplateURLServiceClient : public TemplateURLServiceClient,
                                    const base::string16& term) override;
   void AddKeywordGeneratedVisit(const GURL& url) override;
   bool IsOmniboxExtensionURL(const std::string& url) override;
+  std::string GetExtensionControllingDSEPref() override;
 
   // history::HistoryServiceObserver:
   void OnURLVisited(history::HistoryService* history_service,
@@ -45,6 +49,7 @@ class ChromeTemplateURLServiceClient : public TemplateURLServiceClient,
   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
       history_service_observer_;
   history::HistoryService* history_service_;
+  ExtensionPrefValueMap* extension_prefs_value_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeTemplateURLServiceClient);
 };