Warn when UTCTiming is missing for live
Warn when UTCTiming is missing for live

Without a UTCTiming element in the manifest, a client cannot
synchronize its clock.  This can easily lead to playback failures,
so we warn application developers when we detect this.

Issue #290

Change-Id: Idcb395f5ece67bf2c7d0d984ad277f552d030eb8

Ross-cz/shaka-player,shaka-project/shaka-player,russitto/shaka-player,shaka-project/shaka-player,russitto/shaka-player,vimond/shaka-player,brightcove/shaka-player,brightcove/shaka-player,Ross-cz/shaka-player,vimond/shaka-player,TobbeEdgeware/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player,Ross-cz/shaka-player,indiereign/shaka-player,tvoli/shaka-player,russitto/shaka-player,TheModMaker/shaka-player,TobbeEdgeware/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,shaka-project/shaka-player,baconz/shaka-player,indiereign/shaka-player,tvoli/shaka-player,baconz/shaka-player,shaka-project/shaka-player,TobbeEdgeware/shaka-player,baconz/shaka-player,indiereign/shaka-player,brightcove/shaka-player