SF: Introduce mock::NativeWindow

Test: Builds
Bug: 74827900
Change-Id: I73599f6271274bf1044ae6e2c800e3290111407a
(cherry picked from commit d16bad95ceb623d82d8f84776721f3d355bab89b)
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 7dd5baa..36bc80f 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -27,6 +27,7 @@
         "MockGraphicBufferConsumer.cpp",
         "MockGraphicBufferProducer.cpp",
         "MockMessageQueue.cpp",
+        "MockNativeWindow.cpp",
         "MockRenderEngine.cpp",
         "MockSurfaceInterceptor.cpp",
     ],