perf hists browser: Introduce struct hist_browser title callback
We can now setup title callback for hist_browser, which will be useful in following changes to create customized hist_browsers. This also separates struct perf_evsel dependency out of hist_browser basic code. 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/1466459899-1166-5-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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