allow both GDI and DW fontmgrs at the same time

BUG=
R=bungeman@google.com

Committed: https://code.google.com/p/skia/source/detail?r=10718

Committed: https://code.google.com/p/skia/source/detail?r=10788

Review URL: https://codereview.chromium.org/23058002

git-svn-id: http://skia.googlecode.com/svn/trunk@10851 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed