Make SkPath::isOval() and SkPath::isRRect return the orientation and starting index.

These are tracked in SkPathRef.

Unit tests are updated to test that the returned values are correct.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2012233002

Review-Url: https://codereview.chromium.org/2012233002
7 files changed