SF: add a new behaviour for idle timer on VRR

When idle timer times out on VRR, change the refresh rate
indicator to show "- -". The render rate doesn't cange as a result
of idleness.

Bug: 333443503
Test: manual
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:eba039c2d28646c5064a9a952faaba0cff6350cb)
Merged-In: Ie4f51a2a9da1a5e229b3504881117b12f1fd1b6a
Change-Id: Ie4f51a2a9da1a5e229b3504881117b12f1fd1b6a
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 26e11e5..0ef61b9 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -942,8 +942,9 @@
                 {.platform = {.onReset = [this] { idleTimerCallback(TimerState::Reset); },
                               .onExpired = [this] { idleTimerCallback(TimerState::Expired); }},
                  .kernel = {.onReset = [this] { kernelIdleTimerCallback(TimerState::Reset); },
-                            .onExpired =
-                                    [this] { kernelIdleTimerCallback(TimerState::Expired); }}});
+                            .onExpired = [this] { kernelIdleTimerCallback(TimerState::Expired); }},
+                 .vrr = {.onReset = [this] { mSchedulerCallback.vrrDisplayIdle(false); },
+                         .onExpired = [this] { mSchedulerCallback.vrrDisplayIdle(true); }}});
 
         pacesetter.selectorPtr->startIdleTimer();