SF: add tracing for LayerHistory

Add trace points to help debugging issues related to refresh rate selection.

Test: manual
Bug: 262863132
Change-Id: Ib9b777ba4578ba39a7fbf3f622e9d23ae960dc88
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 856fda0..74a81b7 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -661,6 +661,7 @@
 
 template <typename S, typename T>
 auto Scheduler::applyPolicy(S Policy::*statePtr, T&& newState) -> GlobalSignals {
+    ATRACE_CALL();
     std::vector<display::DisplayModeRequest> modeRequests;
     GlobalSignals consideredSignals;