Correctly handle accessibility for incoming/outgoing calls

The previous behavior relied on WINDOW_STATE_CHANGED events to
announce outgoing/incoming calls, at which point in time
the CallCardFragment was not guaranteed to be non-null.

Bug: 20172391
Change-Id: I65bf86bc1a5edf5430ae5aabcb3535f42d1ccb08
2 files changed
tree: 60bf03ab2edbe1eaa6b02df90accf377d76f38c3
  1. InCallUI/