SkPDF: Emit empty glyph advance.

The PDF standard requires that all Type3 glyphs specify a d0 or d1 with
advance and bounds followed by one or more graphic objects. Empty
glyphs (like space) previously had no entry, but will now provide the
advance, empty bounds, and an empty path.

Bug: skia:8460
Change-Id: I3428c056b6884c72177e5111aa494a888bfb76fb
Reviewed-on: https://skia-review.googlesource.com/c/161500
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>
1 file changed