perf annotate: Introduce annotation_line__print_start() out of TUI code

For the --tui and --stdio2 cases using callbacks for print() and
set_percent_color() end up being the easiest path, real GUI remains as
an exercise.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-1o7az1ng55g2g6ppr2jpeuct@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/annotate.h

@@ -126,6 +126,11 @@ struct annotation_line *
 annotation_line__next(struct annotation_line *pos, struct list_head *head);
 
 double annotation_line__max_percent(struct annotation_line *al, struct annotation *notes);
+void annotation_line__print_start(struct annotation_line *al, struct annotation *notes,
+				  bool first_line, bool current_entry,
+				  void *obj,
+				  void (*obj__set_percent_color)(void *obj, double percent, bool current),
+				  void (*obj__printf)(void *obj, const char *fmt, ...));
 
 int disasm_line__scnprintf(struct disasm_line *dl, char *bf, size_t size, bool raw);
 size_t disasm__fprintf(struct list_head *head, FILE *fp);