Support clipping in InlineContentView

Support clipping for InlineContentView's backing surface
to enable suggestions clipping that does not require re-
parenting which has side effects.

bug:153826463

Test: atest android.widget.cts.inline.InlineContentViewTest#testReparenting

Change-Id: Ia2988ebd660323bf65f0141b4b542a9c4320e178