OffscreenBrowserCompositorOutputSurface for Unified Desktop

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index 145e25fbdb488a5954c0c1319187c6d032cbd63d..431eea5afb5cda16b1138633b5657909bd3184dc 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -32,6 +32,8 @@ class FakeReflector : public Reflector {
   FakeReflector() {}
   ~FakeReflector() override {}
   void OnMirroringCompositorResized() override {}
+  void AddMirroringLayer(Layer* layer) override {}
+  void RemoveMirroringLayer(Layer* layer) override {}
 };
 
 // An OutputSurface implementation that directly draws and swaps to an actual