Stop mutating inputs to decomposeArcToCubic

There's not a lot of gain from doing so, and not doing it will provide
more freedom to the caller (w/ handling of current point.)

BUG=467592

Review URL: https://codereview.chromium.org/1013183002

git-svn-id: svn://svn.chromium.org/blink/trunk@192027 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed
tree: 823467b7c6c2f168f9e29bb8591492f604eed4c1
  1. third_party/