Assert fDeviceClipBounds is always empty when clip is empty

Assert fDeviceClipBounds is always empty when clip is empty

I've fixed a few issues where this assert triggers.  The
nastiest case is when the client sets the clip to a strange
version of an empty rect (Ex: L,T,R,B=0,0,0,10).

I think I've made sufficient fixes so that
fDeviceClipBounds is always empty when clip is empty.

Let's test it though.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2246503003

Review-Url: https://codereview.chromium.org/2246503003