Use FT_LOAD_BITMAP_METRICS_ONLY flag

FT_LOAD_BITMAP_METRICS_ONLY flag was introduced for retrieving font
metrics without decoding or allocating bitmaps.

BUG=skia:

Change-Id: I901531501111f24d8b670305379e04c0bc688e6f
Reviewed-on: https://skia-review.googlesource.com/5580
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed