Make extensions DSE persistent in browser prefs

components/search_engines/template_url_service_client.h

Index: components/search_engines/template_url_service_client.h
diff --git a/components/search_engines/template_url_service_client.h b/components/search_engines/template_url_service_client.h
index 77a22d26706f4ec8eeacf490f5212713a4ff6f4f..cd9756f843a723112d7479cbe1b52aa56a133dab 100644
--- a/components/search_engines/template_url_service_client.h
+++ b/components/search_engines/template_url_service_client.h
@@ -12,6 +12,10 @@ class GURL;
 class TemplateURL;
 class TemplateURLService;
 
+namespace base {
+class Value;
+}
+
 // This interface provides history related functionality required by
 // TemplateURLService.
 // TODO(hashimoto): Get rid of this once HistoryService gets componentized.
@@ -40,6 +44,10 @@ class TemplateURLServiceClient {
   // Given the main search |url| for a TemplateURL, returns whether the
   // TemplateURL is from an omnibox extension.
   virtual bool IsOmniboxExtensionURL(const std::string& url) = 0;
+
+  virtual void SetExtensionControlledPref(
+      const std::string extension_id, const std::string pref_name,
+      std::unique_ptr<base::Value> pref_value) = 0;
 };
 
 #endif  // COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_CLIENT_H_