Merge changes I4e5ff00c,Id5e3ca1d,I97cbba61

* changes:
  SurfaceFlinger: Remove display freezing code
  SurfaceFlinger: add some layer update tests
  SurfaceFlinger: make sync transactions explicit
tree: 02e55cee51a251d92abdbdd23b9ef04feeb9b669
  1. cmds/
  2. include/
  3. libs/
  4. opengl/
  5. services/
  6. MODULE_LICENSE_APACHE2
  7. NOTICE