the core screenshot function now can capture the screen at any lower resolution
performing bilinear filtering.
we also now have some client code to interface with the screenshot service.
it's now possible to request a screenshot at a lower resolution.
Change-Id: I33689bba98507ab928d0898b21596d0d2fe4b953
this captures the framebuffer via surfaceflinger APIs and outputs
it to stdout. this is intended to be used by adbd.
Change-Id: I057e331d28dd92bd45a2c7037ab93e220bbd65f3