Fixes a regression where the foreground was created against the density
in DPI rather than as a scale factor.
Bug: 25602850
Change-Id: Ia871aa5def4319682a73228efb599f31b65afdb6
Only bothers with the background and active ripple, since the exiting
ripples are in hardware animation mode anyway and can't be updated.
Bug: 21079749
Change-Id: I0f70c0c0feea32e2c70bb9b1b0fa3b7846b20c7f
Moves animation lifecycle and software/hardware hand-off into a unified
RippleComponent class, which makes it easier to maintain the components.
Adds better javadocs and comments to explain what's going on.
Bug: 19431322
Change-Id: Ifb9b9a7dcc24238719ef12293493ca3df107679f
