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Remove old code which requests windowOverlays.  When inserting the
fake title bar, put a shadow underneath it.  Do not show it if the
scroll is at the top, since it is transparent, and showing it along
with the shadow below the real title bar would show a darker shadow.

Fixes http://b/issue?id=2118813

Change-Id: I84b8975ea82cc8659b702112c7e67498f863916c

Place the fake title bar in FrameLayout with a shadow overlay and
a white background so it will look like the embedded title bar.

Fixes http://b/issue?id=2123300 and part of http://b/issue?id=2118813

Change-Id: I079cd5100dbc344867a75e3593471bc0c1e3d8eb