Make sure m_usePathFallback is always updated when updating shape

When mutating a shape such that it would change from using the fallback
to _not_ using the fallback, the |m_usePathFallback| flag was not updated
to reflect this, mean that the shape could/would still be painted.

BUG=417454

Review URL: https://codereview.chromium.org/599103005

git-svn-id: svn://svn.chromium.org/blink/trunk@182770 bbb929c8-8fbe-4397-9dbb-9b2b20218538
6 files changed
tree: 32c11c4b5a3204382a20b971b80b15799fde7994
  1. third_party/