SF: Introduce mock::DisplaySurface

Test: Builds
Bug: 74827900
Change-Id: I8526e671a22a53b62dc629b1978bfaaf9103e5ad
diff --git a/services/surfaceflinger/tests/unittests/MockDisplaySurface.cpp b/services/surfaceflinger/tests/unittests/MockDisplaySurface.cpp
new file mode 100644
index 0000000..507626b
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/MockDisplaySurface.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MockDisplaySurface.h"
+
+namespace android {
+namespace mock {
+
+// Explicit default instantiation is recommended.
+DisplaySurface::DisplaySurface() = default;
+DisplaySurface::~DisplaySurface() = default;
+
+} // namespace mock
+} // namespace android