SF: Creating a basic Scheduler class.

Added a flag that can be turned on at runtime, and turns on the new path.
Added a basic Scheduler that encapsulates SF and App thread.

This is part of the go/surfce-flinger-scheduler move.

Test: All SF tests pass. Adding a Scheduler test in the next CL.

Change-Id: Ic45b662f82d60da1172bf64485c838344082b306
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index c000ea2..3e76904 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -69,6 +69,7 @@
 #include "Scheduler/DispSync.h"
 #include "Scheduler/EventThread.h"
 #include "Scheduler/MessageQueue.h"
+#include "Scheduler/Scheduler.h"
 #include "Scheduler/VSyncModulator.h"
 #include "TimeStats/TimeStats.h"
 
@@ -935,6 +936,11 @@
     CreateNativeWindowSurfaceFunction mCreateNativeWindowSurface;
 
     SurfaceFlingerBE mBE;
+
+    bool mUseScheduler = false;
+    std::unique_ptr<Scheduler> mScheduler;
+    sp<Scheduler::ConnectionHandle> mAppConnectionHandle;
+    sp<Scheduler::ConnectionHandle> mSfConnectionHandle;
 };
 }; // namespace android