tree cc98e7952e756c3c8825e7f9af3b280b3fc7b449
parent eb85b8321bc917169ba26c8fce76b64d2e3dfe81
author msarett <msarett@google.com> 1444765814 -0700
committer Commit bot <commit-bot@chromium.org> 1444765814 -0700

Add subsetting to SkScanlineDecoder

This CL allows the SkScanlineDecoder to decode partial
scanlines.

This is a first step in efficiently implementing subsetting
in SkScaledCodec.

BUG=skia:4209

Review URL: https://codereview.chromium.org/1390213002