Handle "frame-less" creation of Touch objects.

Should an empty LocalFrame be used, handle this gracefully.

R=
BUG=395032

Review URL: https://codereview.chromium.org/392223003

git-svn-id: svn://svn.chromium.org/blink/trunk@178444 bbb929c8-8fbe-4397-9dbb-9b2b20218538