tree bf80702bfbf03f11758670b62837ed8a540635e2
parent eba6c6d23a0425e1d66f0f1e2d2ef37969bc597a
author Ady Abraham <adyabr@google.com> 1578358888 -0800
committer Ady Abraham <adyabr@google.com> 1578703161 +0000

SurfaceFlinger: Make LayerHistory virtual class

This is a base CL for refresh rate selection algorithm enhancements
by allowing a different implementation of LayerHistory which will be
controlled by a switch.

Test: watch 24fps video and observe refresh rate at 60Hz
Bug: 147516364
Change-Id: Ifd12f6683bc96cd5aba04a8960b9235729820b49