Support "always allow" for runtime script execution

extensions/browser/extension_prefs.h

Index: extensions/browser/extension_prefs.h
diff --git a/extensions/browser/extension_prefs.h b/extensions/browser/extension_prefs.h
index 4c6adf698cea0c45e5cd995292139c9fe9575fcc..db0431092f79582c46ad2549b1c55ab49d38fffa 100644
--- a/extensions/browser/extension_prefs.h
+++ b/extensions/browser/extension_prefs.h
@@ -400,6 +400,19 @@ class ExtensionPrefs : public ExtensionScopedPrefs, public KeyedService {
   void SetActivePermissions(const std::string& extension_id,
                             const PermissionSet* permissions);
 
+  // Populates |persisted_permissions| with the persisted permissions for the
+  // extension with |extension_id|, returning true on success.
+  bool GetPersistedPermissions(const std::string& extension_id,
+                               URLPatternSet* persisted_permissions);
+
+  // Adds |pattern| to |extension|'s persisted permissions for script injection
+  // requests.
+  void AddPersistedPermission(const Extension* extension,
+                              const URLPattern* pattern);
+
+  // Clears |extension|'s persisted permissions for script injection requests.
+  void ClearPersistedPermissions(const Extension* extension);
+
   // Records whether or not this extension is currently running.
   void SetExtensionRunning(const std::string& extension_id, bool is_running);