fix screen on/off animation (again)

- surfaceflinger now uses the GL-convention of
  placing the origin in the left-bottom corner

- map texture coordinates of the screen capture
  properly

- add the ability to control the animation
  speed through a debug property

Bug: 4989276

Change-Id: Ifb3297bb578078b47146fff666c01f85417e0d6f
2 files changed