[HarfBuzz] DirectWrite backend of HarfBuzz and again, some bits from Mozilla

[Ebrahim Byagowi]

I had a chance to improve some minor thing around DirectWrite backend of
HarfBuzz on this pull request
<https://github.com/behdad/harfbuzz/pull/273> which
basically is suggestion of Nikolay reviews on this mail
<https://lists.freedesktop.org/archives/harfbuzz/2015-September/005066.html>.
Thank you Nikolay for the suggestions and sorry for the delay :)

Going straightly to the reason of this mail, @bas, @bob, I used some of
bits of NativeFontResourceDWrite.cpp
<https://hg.mozilla.org/mozilla-central/filelog/c2da34d96746288b5fee27bf6542a12c9f410988/gfx/2d/NativeFontResourceDWrite.cpp>
on
hb-directwrite
<https://github.com/behdad/harfbuzz/pull/273/files#diff-bad9a60fe707c3516a7fa7f2bf2d190bR49>
of
Mozilla. Even the fact the portion of used things this time maybe not that
much considerable I felt it would be more nice to ask you guys if you are
OK with it as these bits are going to be published with MIT license of
HarfBuzz.

Thank you
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