Make the extension work with 127.0.0.1
Make the extension work with 127.0.0.1

Running ui/run-dev-server prints a link to devserver using 127.0.0.1
address. The problem is that Perfetto UI running with that address can't
connect to extension and incorrectly reports missing extension. This CL
addresses that adding 127.0.0.1 to allowlist.

Change-Id: I4175cf0ea5519fdda722db55f5b99827b252fc9f
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto