More general image filter interface; tested implementation of standalone
image scaler (not yet plumbed).  High quality downsampler.  Fast SSE
resampler.

BUG=
R=reed@google.com

Review URL: https://codereview.chromium.org/17381008

git-svn-id: http://skia.googlecode.com/svn/trunk@9936 2bbb7eff-a529-9590-31e7-b0007b416f81
18 files changed