Add new ANA stats to the old GetStats() to count the number of actions taken by each controller.

This CL only wires up the new stats but does not set the values yet. This will be added in a follow-up CL.

BUG=webrtc:8127

Review-Url: https://codereview.webrtc.org/3011623002
Cr-Original-Commit-Position: refs/heads/master@{#19751}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: e1198e068bdcb01dcb8799d6871018092711714e
27 files changed