Add unit tests for android::compositionengine::impl::planner::CachedSet

Fixes: 180672491
Test: adb shell /data/nativetest64/libcompositionengine_test/libcompositionengine_test
Change-Id: I4a31268c25329d1b25682fa18352cbea0141a112
diff --git a/services/surfaceflinger/CompositionEngine/Android.bp b/services/surfaceflinger/CompositionEngine/Android.bp
index f9e5b9a..88998b0 100644
--- a/services/surfaceflinger/CompositionEngine/Android.bp
+++ b/services/surfaceflinger/CompositionEngine/Android.bp
@@ -103,6 +103,7 @@
     test_suites: ["device-tests"],
     defaults: ["libcompositionengine_defaults"],
     srcs: [
+        "tests/planner/CachedSetTest.cpp",
         "tests/CompositionEngineTest.cpp",
         "tests/DisplayColorProfileTest.cpp",
         "tests/DisplayTest.cpp",