Add support for 8 bits/component glyphs, to

Add support for 8 bits/component glyphs, to
better match the fonts produced by CoreText on OS/X.

M    include/config/SkUserConfig.h
M    include/core/SkMask.h
M    include/core/SkScalerContext.h
M    src/core/SkBlitter_ARGB32.cpp
M    src/core/SkScalerContext.cpp
M    src/core/SkPaint.cpp
M    src/gpu/SkGrFontScaler.cpp
M    src/ports/SkFontHost_mac_coretext.cpp
M    src/ports/SkFontHost_mac.cpp
M    gpu/include/GrTypes.h
M    gpu/src/GrAtlas.cpp

git-svn-id: http://skia.googlecode.com/svn/trunk@1672 2bbb7eff-a529-9590-31e7-b0007b416f81