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: I5a3b0e431421800e3aad601d9af8f94adffbc71f
this captures the framebuffer via surfaceflinger APIs and outputs
it to stdout. this is intended to be used by adbd.
Change-Id: I0cfa6a47ec121edcd93f46b64870f9a553f653ff
