SF: move trunk stable flags to FlagManager

Test: presubmit
Bug: 297389311
Bug: 278199093
Bug: 284845445
Bug: 273702768
Bug: 259132483
Bug: 283055450
Change-Id: I2a85b2534ac8d472acd0de443785317871bbfe89
diff --git a/services/surfaceflinger/Scheduler/EventThread.cpp b/services/surfaceflinger/Scheduler/EventThread.cpp
index 9a55c94..7f627f8 100644
--- a/services/surfaceflinger/Scheduler/EventThread.cpp
+++ b/services/surfaceflinger/Scheduler/EventThread.cpp
@@ -45,6 +45,7 @@
 
 #include <scheduler/VsyncConfig.h>
 #include "DisplayHardware/DisplayMode.h"
+#include "FlagManager.h"
 #include "FrameTimeline.h"
 #include "VSyncDispatch.h"
 #include "VSyncTracker.h"
@@ -308,7 +309,7 @@
     auto connection = sp<EventThreadConnection>::make(const_cast<EventThread*>(this),
                                                       IPCThreadState::self()->getCallingUid(),
                                                       eventRegistration);
-    if (flags::misc1()) {
+    if (FlagManager::getInstance().misc1()) {
         const int policy = SCHED_FIFO;
         connection->setMinSchedulerPolicy(policy, sched_get_priority_min(policy));
     }