IME for Mus: Make InputMethodMus use the IME Mojo API.

services/ui/ime/test_ime_driver/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("//services/shell/public/cpp/service.gni")
 import("//services/shell/public/service_manifest.gni")
 import("//testing/test.gni")
 
-service("test_ime_driver") {
+source_set("lib") {
   sources = [
-    "main.cc",
+    "test_ime_application.cc",
+    "test_ime_application.h",
     "test_ime_driver.cc",
     "test_ime_driver.h",
   ]
 
   deps = [
     "//base",
     "//services/shell/public/cpp",
     "//services/ui/public/cpp",
     "//services/ui/public/interfaces",
-    "//ui/gfx/geometry/mojo",
+  ]
+}
+
+service("test_ime_driver") {
+  sources = [
+    "main.cc",
+  ]
+
+  deps = [
+    ":lib",
+    "//base",
+    "//services/shell/public/cpp",
+    "//services/ui/public/cpp",
+    "//services/ui/public/interfaces",
   ]
 
   data_deps = [
     ":manifest",
     "//services/ui",
   ]
 }
 
 service_manifest("manifest") {
   name = "test_ime_driver"
   source = "manifest.json"
 }