commit 94dd7a52d3fe0632cd830f2e9cd14103c2726aac
author reed <reed@google.com> Wed Oct 14 07:49:35 2015 -0700
committer Commit bot <commit-bot@chromium.org> Wed Oct 14 07:49:35 2015 -0700
tree 299c8ac23f462f1360df47af72076a5253c89791
parent d0f0bceb0e88d7527dc83a75a8851f115d706522

change back to method for localmatrix imagefilter

This method is different from MatrixFilter, in that MatrixFilter does not require a pre-existing
filter, but LocalM does. Also change the comment to be more general, as there is no promise that
we return a different subclass, and certainly not a specific subclass.

This pattern of obj->newWithModifiers() also more closely matches the pattern in SkImage (newSubset).

BUG=skia:

Review URL: https://codereview.chromium.org/1402133002