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/Android.bp b/services/surfaceflinger/CompositionEngine/Android.bp
index 564bd5b..1651cc4 100644
--- a/services/surfaceflinger/CompositionEngine/Android.bp
+++ b/services/surfaceflinger/CompositionEngine/Android.bp
@@ -44,6 +44,7 @@
         "src/Layer.cpp",
         "src/Output.cpp",
         "src/OutputCompositionState.cpp",
+        "src/OutputLayer.cpp",
         "src/RenderSurface.cpp",
     ],
     local_include_dirs: ["include"],
@@ -61,6 +62,7 @@
         "mock/Layer.cpp",
         "mock/LayerFE.cpp",
         "mock/Output.cpp",
+        "mock/OutputLayer.cpp",
         "mock/RenderSurface.cpp",
     ],
     static_libs: [
@@ -83,6 +85,7 @@
         "tests/LayerTest.cpp",
         "tests/MockHWComposer.cpp",
         "tests/OutputTest.cpp",
+        "tests/OutputLayerTest.cpp",
         "tests/RenderSurfaceTest.cpp",
     ],
     static_libs: [