Revert "SF: Remove refresh_rate_switching flag."

This reverts commit 8c6f3f6bd0c5edce7aa9bfd61b64dd2e7dc43deb.

Reason for revert: Crashes on ToT (b/148822765, b/148821456)

Change-Id: If1bc13b33321727244c3b0f15a0e7b30665d1c43
diff --git a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
index 89002a8..82a00ee 100644
--- a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
@@ -73,7 +73,8 @@
     std::vector<scheduler::RefreshRateConfigs::InputConfig> configs{
             {{HwcConfigIndexType(0), HwcConfigGroupType(0), 16666667}}};
     mRefreshRateConfigs = std::make_unique<
-            scheduler::RefreshRateConfigs>(configs, /*currentConfig=*/HwcConfigIndexType(0));
+            scheduler::RefreshRateConfigs>(/*refreshRateSwitching=*/false, configs,
+                                           /*currentConfig=*/HwcConfigIndexType(0));
 
     mScheduler = std::make_unique<TestableScheduler>(*mRefreshRateConfigs, false);