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/FpsTest.cpp b/services/surfaceflinger/tests/unittests/FpsTest.cpp
index b44dd89..88b74d2 100644
--- a/services/surfaceflinger/tests/unittests/FpsTest.cpp
+++ b/services/surfaceflinger/tests/unittests/FpsTest.cpp
@@ -14,12 +14,13 @@
  * limitations under the License.
  */
 
-#include "Fps.h"
-#include "FpsOps.h"
-
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
+#include <scheduler/Fps.h>
+
+#include "FpsOps.h"
+
 namespace android {
 
 TEST(FpsTest, construct) {