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Adding ui specific init function allowing to setup the progress bar
width based on current screen scales.

Adding TUI init function to get more grained update of the progress bar.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170908120510.22515-4-jolsa@kernel.org

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>