Add support for SK_MSCALAR_IS_FLOAT

The default is SK_MSCALAR_IS_FLOAT. You'll have to explicitly define SK_MSCALAR_IS_DOUBLE if that's what you want.

BUG=None

Review URL: https://codereview.appspot.com/6843049

git-svn-id: http://skia.googlecode.com/svn/trunk@6403 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed