(struct redisplay_history) [GLYPH_DEBUG]: New.

(struct redisplay_history) [GLYPH_DEBUG]: New.
(REDISPLAY_HISTORY_SIZE) [GLYPH_DEBUG]: New macro.
(redisplay_history, history_idx, history_tick) [GLYPH_DEBUG]: New
variables.
(add_window_display_history, add_frame_display_history)
(Fdump_redisplay_history) [GLYPH_DEBUG]: New functions.
(build_frame_matrix_from_leaf_window): Remove unused code.
(build_frame_matrix_from_leaf_window) [GLYPH_DEBUG]: Add to
redisplay history.
(update_frame) [GLYPH_DEBUG]: Add to redisplay history.
(update_window) [GLYPH_DEBUG]: Likewise.
(syms_of_display): Defsubr dump-redisplay-history.