For debugging and development purposes it's sometimes useful to run the
full Android system in a single and statically sized window. This is not
going to be a widely used mode but can be helpful at times.
Also makes our window/layer management a bit more modular to allow easy
additions of new strategies/impementations.
Audio playback still has a delay about 1-2 seconds but it's usable.
This also moves the platform policy class into its own namespace to be
not specific to just window management.
