Block content scripts from executing until user grants permission

extensions/common/user_script.h

Index: extensions/common/user_script.h
diff --git a/extensions/common/user_script.h b/extensions/common/user_script.h
index 05974c7fa4db6359e50c30a4e67339da9cc644c9..cedfc16a6bd9ffddfb6fddc4bcef63fcd39ed024 100644
--- a/extensions/common/user_script.h
+++ b/extensions/common/user_script.h
@@ -45,6 +45,8 @@ class UserScript {
                     // is "idle". Currently this uses the simple heuristic of:
                     // min(DOM_CONTENT_LOADED + TIMEOUT, ONLOAD), but no
                     // particular injection point is guaranteed.
+    RUN_DEFERRED,  // The user script's injection was deferred for permissions
+                   // reasons, and was executed at a later time.
     RUN_LOCATION_LAST  // Leave this as the last item.
   };