Because the Widevine Sample Play is frequently used to report bugs, it is helpful to have users' actions logged. This change prints to the android log whenever the user changes settings, clicks play, full screen, acquire rights, etc. This code does not change the build and is not delivered to customers. It is delivered to vendors. Change-Id: I62c34c2f1683af881a3c326a48f039b463ca3e8e