Add a PermissionDeniedError, update Push API public API

Source/modules/push_messaging/PushError.cpp

Index: Source/modules/push_messaging/PushError.cpp
diff --git a/Source/modules/push_messaging/PushError.cpp b/Source/modules/push_messaging/PushError.cpp
index f095d6732a9855d4763dce6cfeeea0e0947de102..7cc7beafa2b6010ed08c69d1aa683f6c3d18026d 100644
--- a/Source/modules/push_messaging/PushError.cpp
+++ b/Source/modules/push_messaging/PushError.cpp
@@ -21,6 +21,8 @@ DOMException* PushError::take(ScriptPromiseResolver*, const WebPushError& webErr
         return DOMException::create(NotFoundError, webError.message);
     case WebPushError::ErrorTypeNotSupported:
         return DOMException::create(NotSupportedError, webError.message);
+    case WebPushError::ErrorTypePermissionDenied:
+        return DOMException::create(PermissionDeniedError, webError.message);
     case WebPushError::ErrorTypeUnknown:
         return DOMException::create(UnknownError, webError.message);
     }