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..b2621b2f8b28cf5e18e91ddfd348b984048b51f9 100644
--- a/chrome/browser/search_engines/chrome_template_url_service_client.h
+++ b/chrome/browser/search_engines/chrome_template_url_service_client.h
@@ -10,6 +10,14 @@
 #include "components/history/core/browser/history_service_observer.h"
 #include "components/search_engines/template_url_service_client.h"
 
+namespace base {
+class Value;
+}
+
+namespace extensions {
+class PreferenceAPI;
+}
+
 namespace history {
 class HistoryService;
 }
@@ -20,7 +28,8 @@ class ChromeTemplateURLServiceClient : public TemplateURLServiceClient,
                                        public history::HistoryServiceObserver {
  public:
   explicit ChromeTemplateURLServiceClient(

[vasilii, 2016/11/07 15:00:05]

no explicit.

-      history::HistoryService* history_service);
+      history::HistoryService* history_service,
+      extensions::PreferenceAPI* pref_api);
   ~ChromeTemplateURLServiceClient() override;
 
   // TemplateURLServiceClient:
@@ -40,11 +49,16 @@ class ChromeTemplateURLServiceClient : public TemplateURLServiceClient,
                     const history::RedirectList& redirects,
                     base::Time visit_time) override;
 
+void SetExtensionControlledPref(
+      const std::string extension_id, const std::string pref_name,

[vasilii, 2016/11/07 15:00:05]

const std::string&

+      std::unique_ptr<base::Value> pref_value) override;
+
  private:
   TemplateURLService* owner_;
   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
       history_service_observer_;
   history::HistoryService* history_service_;
+  extensions::PreferenceAPI* pref_api_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeTemplateURLServiceClient);
 };