Fix Broken PathMeasureTest#testIsClosed

Bug 3188260

It wasn't broken, but it said it was flakey. I didn't see anything
really flakey except the test was somewhat confusing so replace it
with some easy examples like testing a line segment and a circle.

Change-Id: I483cb363e495f97664a55e2d8c05f435a15aba8f
1 file changed