add path dump test

Add a unit test for SkPath::dump(). The unit test exposed a minor
bug (inconsistent CRs) and an unused parameter (title).

R=bsalomon@google.com
TBR=bsalomon
BUG=skia:1836

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/351833003
4 files changed