Introduce DisplayCompositor Mojo API for Mus

components/mus/surfaces/BUILD.gn

Index: components/mus/surfaces/BUILD.gn
diff --git a/components/mus/surfaces/BUILD.gn b/components/mus/surfaces/BUILD.gn
index 7437781241f9445adee25f2b4561ee424444327c..60a1cef98202ffe31b2f82240c96c2b8973c1ccf 100644
--- a/components/mus/surfaces/BUILD.gn
+++ b/components/mus/surfaces/BUILD.gn
@@ -6,10 +6,19 @@ import("//build/config/ui.gni")
 
 source_set("surfaces") {
   sources = [
+    "compositor_frame_sink_delegate.h",
+    "compositor_frame_sink_factory_impl.cc",
+    "compositor_frame_sink_factory_impl.h",
+    "compositor_frame_sink_impl.cc",
+    "compositor_frame_sink_impl.h",
     "direct_output_surface.cc",
     "direct_output_surface.h",
     "display_compositor.cc",
     "display_compositor.h",
+    "display_compositor_impl.cc",
+    "display_compositor_impl.h",
+    "display_impl.cc",
+    "display_impl.h",
     "surfaces_context_provider.cc",
     "surfaces_context_provider.h",
     "surfaces_context_provider_delegate.h",
@@ -28,6 +37,7 @@ source_set("surfaces") {
     "//components/mus/gles2",
     "//components/mus/public/cpp/surfaces",
     "//components/mus/public/interfaces",
+    "//components/mus/public/interfaces/gpu:interfaces",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_cmd_helper",
     "//gpu/command_buffer/client:gles2_implementation",