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skia::PaintSimplifier subclasses SkDrawFilter to reduce the quality of draws. The intent is to be able to place less of a burden on the rasterizer during Android flings or other situations where we need a lot of pixels but they won't spend long on screen.

This CL does not actually invoke the PaintSimplifier. The code is extracted from https://codereview.chromium.org/12210081/; deciding when to simplify will be a separate CL.

BUG=174945
TBR=reed

Review URL: https://chromiumcodereview.appspot.com/12207157

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182475 0039d316-1c4b-4281-b951-d872f2087c98