Refactors keyboard related code so mash can use a keyboard

ui/keyboard/BUILD.gn

Index: ui/keyboard/BUILD.gn
diff --git a/ui/keyboard/BUILD.gn b/ui/keyboard/BUILD.gn
index 3bad9bf0316a65c03db3a5ae3eb0794c03d37507..ae966b8b4483a53e17c832d06476cb18ac300f84 100644
--- a/ui/keyboard/BUILD.gn
+++ b/ui/keyboard/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//third_party/google_input_tools/closure.gni")
 import("//third_party/google_input_tools/inputview.gni")
@@ -126,6 +127,15 @@ build_closure("inputview") {
   path = rebase_path("//third_party/google_input_tools")
 }
 
+mojom("mojom") {
+  sources = [
+    "keyboard.mojom",
+  ]
+  deps = [
+    "//ui/mojo/geometry:interfaces",
+  ]
+}
+
 test("keyboard_unittests") {
   sources = [
     "keyboard_controller_unittest.cc",