Add cmap 3,0 (symbol) as Unicode fallback.

FreeType automatically selects the 'most Unicode' cmap available,
otherwise the default cmap is NULL. When this happens the fallback
should include the 3,0 symbol cmap, as is outlined in the Apple
TrueType documentation. This cmap should effectively be a Unicode
mapping, but exclusively in the private use area.

BUG=skia:1873,chromium:489452

Review URL: https://codereview.chromium.org/1163833003
3 files changed