SF: Set up libscheduler headers

Start pulling Scheduler sources into a libscheduler target akin to
librenderengine and libcompositionengine.

Bug: 185535769
Test: Build
Change-Id: I8ee871cce96209c8c53601152501129b09c5e46f
diff --git a/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp b/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
index f25994e..5c2d2e1 100644
--- a/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
@@ -19,7 +19,8 @@
 
 #include <gtest/gtest.h>
 
-#include "Fps.h"
+#include <scheduler/Fps.h>
+
 #include "FpsOps.h"
 #include "Scheduler/LayerHistory.h"
 #include "Scheduler/LayerInfo.h"