Introduce Display Compositor mojo interface. Use InProcessContextProvider.

services/ui/surfaces/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 source_set("surfaces") {
   sources = [
     "direct_output_surface.cc",
     "direct_output_surface.h",
     "display_compositor.cc",
     "display_compositor.h",
-    "surfaces_context_provider.cc",
-    "surfaces_context_provider.h",
-    "surfaces_context_provider_delegate.h",
+    "gpu_compositor_frame_sink.cc",
+    "gpu_compositor_frame_sink.h",
+    "mus_gpu_memory_buffer_manager.cc",
+    "mus_gpu_memory_buffer_manager.h",
   ]
 
   deps = [
     "//base",
     "//cc",
     "//cc/ipc:internal_interfaces",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
     "//components/display_compositor",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_cmd_helper",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/command_buffer/client:gles2_interface",
+    "//gpu/ipc:command_buffer",
     "//gpu/ipc/client",
+    "//gpu/ipc/common",
     "//services/service_manager/public/cpp",
     "//services/tracing/public/cpp",
     "//services/ui/common:mus_common",
+    "//services/ui/gpu/interfaces",
     "//services/ui/public/interfaces",
     "//ui/display/types",
     "//ui/gfx",
     "//ui/gfx/geometry/mojo",
     "//ui/gl",
   ]
 
   if (use_ozone) {
     sources += [
       "direct_output_surface_ozone.cc",
       "direct_output_surface_ozone.h",
     ]
     deps += [ "//gpu/command_buffer/common" ]
   }
 }