Use the right point for marker orientation when closing a subpath

Path::apply doesn't pass a point along for the PathElementCloseSubpath
command. This would yield the wrong orientation on the last marker-mid
on the path (see crbug.com/633012#c1 for an example.)
Use m_subpathStart where needed instead.

BUG=633012

Review-Url: https://codereview.chromium.org/2539763002
Cr-Commit-Position: refs/heads/master@{#434988}
3 files changed