tree 6dd59cf90dd96a443a50ae4b6fa14be6f778c823
parent cf9bafceafaf6c0bf8b0eac8de509aa1d8407fca
author reed <reed@google.com> 1459699873 -0700
committer Commit bot <commit-bot@chromium.org> 1459699873 -0700

change flattenable factory to return sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1855733002

Review URL: https://codereview.chromium.org/1855733002