GitLab

Add a NetworkActivationHandler for handling cellular activation calls to Shill.

BUG=188753
TEST=tested Verizon LTE (on link) and Verizon 3g (on Lumpy) activation

Review URL: https://chromiumcodereview.appspot.com/22611005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220463 0039d316-1c4b-4281-b951-d872f2087c98