commit 55910dc29d9690d8c34ac328db2f35a4934b64b9
author Kevin DuBois <kevindubois@google.com> Fri Mar 15 10:12:28 2019 -0700
committer linpeter <linpeter@google.com> Thu Nov 21 14:27:34 2019 +0800
tree 322da467e7f9dbbf86428d6ff410734970fd2eb0
parent 15450187a701ba54fac80fc10deb5e0550e22365

composer: add histogram dispatch to event loop

Adds histogram event registration and handling to UEventThread.
This is similar to other events sourcing from /dev/dri/card0. This
registers the event, but it is not requested yet (followup patch
will add requests for the event to the drm atomic commit)

cherry pick from hardware/qcom/sm8150/display

Bug: 143513619
Test: ./color_sampling_test
Test: libgui_test  --gtest_filter=DisplayedContentSamplingTest*
Test: dumpsys SurfaceFlinger

Change-Id: I21603bb23b91f462d8680fcc9f146090f01eaa2f