tree 20800f4a221c12e74c479ec7542c4d2e95197c49
parent 105e64bea07920857a2458d68e61db24d6c0230f
author Robert Carr <racarr@google.com> 1520455714 -0800
committer Robert Carr <racarr@google.com> 1520627095 -0800

SurfaceFlinger: Add "Abstract" Layer type.

Add an Abstract Layer type which exists only to be a parent. We
will use this to more cleanly represent the various hierarchy Layers
from the WM and for an upcoming screenshot rework.

Bug: 72760590
Test: Existing tests pass
Change-Id: Icd19ab0a467585660a95ae37b9c5dd4b8106da9d