Existing hidden methods allow activities to be notified when their windows have completed animating in. This change adds that capability to system windows using a ViewTreeObserver callback since system windows lack an activity token. The first subsystem to use this is the UserSwitchingDialog which was previously using a 250 msec timeout to dismiss the dialog. That deadline was often missed leaving the user with no dialog on the screen during the transition. Fixes bug 16661752. Change-Id: I70789e0d9c07112f275e76fb82850926305f290d
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