Update API per council requests

launchTaskBehindBackgroundAnimation => launchTaskBehindTargetAnimation
visibilityMode => transitionVisiblityMode
makeLaunchTaskBehindAnimation => makeTaskLaunchBehind
launch_task_behind_background = launch_task_behind_target

Fixes bug 16958544.

Change-Id: I3b7c791fc0671b8071a5377cf6fa878bd5861f70
8 files changed