Send pipeToFile receive event at most once per sec for Android
Move secure tests to the end since timeout will affect subsequent tests

The secure API seems broken on Android 21. It works fine on Android 19.
Send pipeToFile receive event at most once per sec for iOS
chrome.sockets.pipeToFile: send receive events 10 times per sec
Merge pull request #454 from oahziur/sockets-pipe-delay

Sockets pipeToFile send receive at most once per sec