Enable Comma-seperated List in #forminput parser function
The "form=" parameter for #forminput can now take a comma-separated
list of form names as a value and then display them in the dropdown.
Form names with a comma must be escaped using a backslash: "\,".
Bug: T187110
Change-Id: I615bdf1da6b01ff3587f43f4282422fa71c3abaa