Move SkFontMgr and SkFontStyle impls to own cpp.

Move SkFontMgr and SkFontStyle impls to own cpp.

SkFontMgr and SkFontStyle implementations are currently burried in the
old SkFontHost.cpp file. Move these implementations to their own file
so that the implementations are easier to find, and to make clearer that
SkFontHost.cpp needs to be removed.

Committed: https://skia.googlesource.com/skia/+/e1a828c555223e75ebf83d0674daa2e6fd5889a3

[bungeman-skia, 2015-01-20 18:28:05]

bungeman@google.com changed reviewers:
+ mtklein@google.com, reed@google.com

[bungeman-skia, 2015-01-20 18:28:06]

Basic cleanup for sanity.

I'm not sure how much work it is to get Chromium to really use SkSurface for all
of it's device geometry needs, but if they did we can delete all the rest of
SkFontHost, etc.

[mtklein, 2015-01-20 18:31:33]

lgtm

[bungeman-skia, 2015-01-20 18:39:22]

The CQ bit was checked by bungeman@google.com

[commit-bot: I haz the power, 2015-01-20 18:39:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/799533004/1

[commit-bot: I haz the power, 2015-01-20 18:48:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-01-20 18:48:52]

Try jobs failed on following builders:
  Build-Win-VS2013-x86-Debug-Trybot on client.skia.compile
(http://build.chromium.org/p/client.skia.compile/builders/Build-Win-VS2013-x86...)

[bungeman-skia, 2015-01-20 19:07:13]

The CQ bit was checked by bungeman@google.com

[commit-bot: I haz the power, 2015-01-20 19:08:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/799533004/20001

[commit-bot: I haz the power, 2015-01-20 19:15:40]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/e1a828c555223e75ebf83d0674daa2e6fd5889a3