Fixed crash from swapping focus.
Fixed crash from swapping focus.

Sometimes if you swapped focus, it's possible to cause
SendKeyDownUpSync to send keypress events to activities other than
itself, raising an exception.  Since there doesn't seem to be a good
way to prevent this, I added exception handling, as such occurances
are otherwise harmless.

Change-Id: I33878dfb60fa1e3d3061b8d46bdf7831dba0ae30

google/fplbase,google/fplbase,google/fplbase,google/fplbase