[1/2] Keyguard: Add unlock icons for Gmail and Snapchat

Change-Id: I3e3df643eec4d02a20855a53b6fd4f8b59fb0ede
Merge "[1/2] Keyguard: Add unlock icons for Gmail and Snapchat" into android-4.4
Merge remote-tracking branch 'omni/android-4.4' into android-4.4