Introduce Display Compositor mojo interface. Use InProcessContextProvider.

services/ui/gpu/BUILD.gn

 # Copyright 2016 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")
 import("//services/service_manager/public/service_manifest.gni")
 import("//testing/test.gni")
 
 source_set("gpu") {
   output_name = "mus_gpu"
 
   sources = [
     "gpu_main.cc",
     "gpu_main.h",
     "gpu_service_internal.cc",
     "gpu_service_internal.h",
   ]
 
   defines = [ "NOTIMPLEMENTED_POLICY=5" ]
 
   deps = [
+    "//cc",
+    "//gpu/ipc:command_buffer",
     "//gpu/ipc/common",
     "//gpu/ipc/service",
     "//ipc",
     "//media/gpu/ipc/service",
     "//mojo/public/cpp/system",
     "//services/service_manager/public/cpp",
     "//services/ui/common:mus_common",
     "//services/ui/gpu/interfaces",
     "//services/ui/public/interfaces",
+    "//services/ui/surfaces",
     "//ui/gfx:memory_buffer",
     "//ui/gl/init",
   ]
 
   if (use_ozone) {
     deps += [ "//ui/ozone:ozone" ]
   }
 }
 
 group("tests") {
@@ skipping 16 matching lines @@
 
   data_deps = [
     ":mus_gpu_unittests_app_manifest",
   ]
 }
 
 service_manifest("mus_gpu_unittests_app_manifest") {
   name = "mus_gpu_unittests_app"
   source = "mus_gpu_unittests_app_manifest.json"
 }