Implement AImageDecoder _advanceFrame and _rewind

Bug: 160984428
Test: Iae7d274b69999c471fd5610c6ef4d148cca81bec

Disallow AImageDecoder_set* methods after the first frame, since
changing the settings would interfere with blending and caching for
kRestorePrevious frames.

Add a cache (and a state machine) for handling kRestorePrevious frames.

Follow-on to Ib93b0ced09fa3cca4a6681745406355c48158fae - support using
a matrix for unpremul + orientation (the orientation was previously
handled by a matrix internally in SkAndroidCodec).

Change-Id: I7c32ede013fa83f1fe95c35778c33278ca6fe6a3