SF: Define mock::MessageQueue

Test: Builds
Bug: 74827900
Change-Id: Id7bed6f01f7df0993c57cb6395b8a0df779ccead
(cherry picked from commit c9903eff3f1dce707e2ea0f26d4e7aa6019d02cd)
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 353b245..aa88cb1 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -24,6 +24,7 @@
         "MockEventThread.cpp",
         "MockGraphicBufferConsumer.cpp",
         "MockGraphicBufferProducer.cpp",
+        "MockMessageQueue.cpp",
         "MockRenderEngine.cpp",
     ],
     static_libs: [