Document that degenerate lines wont be drawn
Document that degenerate lines wont be drawn

bug:7658830

Skia and the HW acceleration path don't render anything for degenerate
lines.

Change-Id: I5ea6fe8f16533e5045a7cd10475f4240f6c311b6

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base