athena: Use mojo to provide the bindings for the virtual keyboard.

ui/keyboard/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("//tools/grit/grit_rule.gni")
 
 component("keyboard") {
   sources = [
     "keyboard.cc",
     "keyboard.h",
@@ skipping 34 matching lines @@
 }
 
 grit("resources_grit") {
   source = "keyboard_resources.grd"
   outputs = [
     "grit/keyboard_resources.h",
     "grit/keyboard_resources_map.h",
     "keyboard_resources.pak",
     "keyboard_resources.rc",
   ]
+
+  keyboard_mojom_gen_js = "$root_gen_dir/ui/keyboard/webui/keyboard.mojom.js"
+  grit_flags = [
+    "-E", "keyboard_mojom_gen_js=" +
+          rebase_path(keyboard_mojom_gen_js, root_build_dir),
+  ]
+
+  deps = [
+    "webui:mojo_bindings"
+  ]
 }
 
 copy("resources") {
   sources = [ "$target_gen_dir/keyboard_resources.pak" ]
   outputs = [ "$root_out_dir/keyboard_resources.pak" ]
   deps = [ ":resources_grit" ]
   forward_dependent_configs_from = deps
 }
 
 # TODO(GYP) enable this when all dependencies are resolved. Some transitive
@@ skipping 21 matching lines @@
     "//ui/compositor:test_support",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/resources:ui_test_pak",
     "//ui/wm",
     "//url",
   ]
 }
 
 }