Initial native keyboard proof of concept.

services/keyboard_native/BUILD.gn

Index: services/keyboard_native/BUILD.gn
diff --git a/sky/services/platform/BUILD.gn b/services/keyboard_native/BUILD.gn
similarity index 53%
copy from sky/services/platform/BUILD.gn
copy to services/keyboard_native/BUILD.gn
index 2bd0c74c2453776990fc1df36252d084d6dfd081..918a4e58bcece261944b623c44c4b41ce5975c1f 100644
--- a/sky/services/platform/BUILD.gn
+++ b/services/keyboard_native/BUILD.gn
@@ -2,25 +2,22 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("platform") {
+import("//mojo/public/mojo_application.gni")
+
+mojo_native_application("keyboard_native") {
   sources = [
-    "net_constants.h",
-    "platform_impl.cc",
-    "platform_impl.h",
-    "url_request_types.cc",
-    "url_request_types.h",
-    "weburlloader_impl.cc",
-    "weburlloader_impl.h",
+    "keyboard_service_impl.cc",
+    "keyboard_service_impl.h",
   ]
 
   deps = [
     "//base",
     "//mojo/common",
+    "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/environment",
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
-    "//mojo/services/network/public/interfaces",
-    "//sky/engine",
-    "//url",
+    "//mojo/services/keyboard/public/interfaces",
   ]
 }