Fix animations, padding in RTL mode.

Show directory animations coming in from left-side when in RTL
language.  Also fix NinePatchDrawable to correctly mirror its padding
when auto-mirrored, and fix InsetDrawable to propagate the layout
direction to the wrapped Drawable.

Bug: 10987190, 11030793
Change-Id: I1213802a07d0c4ced93438df1e6ddf5aed3df677