tree 0b801d131d01d45e83160a6d0d877949590908de
parent 2edf0c6a719b8dff4365628cf3b4481c5035f07a
author bungeman <bungeman@google.com> 1468360879 -0700
committer Commit bot <commit-bot@chromium.org> 1468360879 -0700

Factor code to rotate a canvas about a point.

SkMatrix::scale and ::rotate take a point around which to scale or rotate.
Canvas lacks these helpers, so the code to rotate a canvas around a
point has been duplicated many times. Factor all of these
implementations into SkCanvas::rotate.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2142033002

Review-Url: https://codereview.chromium.org/2142033002