SF: Intro CE::OutputLayer

Introduce compositionengine::OutputLayer, for representing the
composition state of a layer on an output (display)

This change just introduces the OutputLayer class, and modifies
SurfaceFlinger.cpp to create them properly. The new class does not yet
have any state.

Test: atest libsurfaceflinger_unittest libcompositionengine_test
Bug: 121291683
Change-Id: Ic8fe0fee61470b36539287883d4901b25208b634
diff --git a/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/OutputLayer.h b/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/OutputLayer.h
new file mode 100644
index 0000000..f3d0258
--- /dev/null
+++ b/services/surfaceflinger/CompositionEngine/include/compositionengine/impl/OutputLayer.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2019 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.
+ */
+
+#pragma once
+
+#include <memory>
+
+#include <compositionengine/OutputLayer.h>
+
+namespace android::compositionengine::impl {
+
+class OutputLayer : public compositionengine::OutputLayer {
+public:
+    OutputLayer(const compositionengine::Output&, std::shared_ptr<compositionengine::Layer>,
+                sp<compositionengine::LayerFE>);
+    ~OutputLayer() override;
+
+    const compositionengine::Output& getOutput() const override;
+    compositionengine::Layer& getLayer() const override;
+    compositionengine::LayerFE& getLayerFE() const override;
+
+private:
+    const compositionengine::Output& mOutput;
+    std::shared_ptr<compositionengine::Layer> mLayer;
+    sp<compositionengine::LayerFE> mLayerFE;
+};
+
+std::unique_ptr<compositionengine::OutputLayer> createOutputLayer(
+        const compositionengine::Output&, std::shared_ptr<compositionengine::Layer>,
+        sp<compositionengine::LayerFE>);
+
+} // namespace android::compositionengine::impl