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

ui/views/mus/BUILD.gn

Index: ui/views/mus/BUILD.gn
diff --git a/ui/views/mus/BUILD.gn b/ui/views/mus/BUILD.gn
index 81f81986d7d7e25c2856be18f06a08474bd7bd61..bfcf7d95fcb0fe66db33d4c1e4e851842ce15731 100644
--- a/ui/views/mus/BUILD.gn
+++ b/ui/views/mus/BUILD.gn
@@ -35,6 +35,8 @@ component("mus") {
     "screen_mus_delegate.h",
     "surface_context_factory.cc",
     "surface_context_factory.h",
+    "text_input_client_impl.cc",
+    "text_input_client_impl.h",
     "window_manager_connection.cc",
     "window_manager_connection.h",
     "window_manager_constants_converters.cc",
@@ -153,6 +155,7 @@ test("views_mus_unittests") {
 
   sources = [
     "display_list_unittest.cc",
+    "input_method_mus_unittest.cc",
     "native_widget_mus_unittest.cc",
     "run_all_unittests_mus.cc",
     "screen_mus_unittest.cc",
@@ -185,6 +188,7 @@ test("views_mus_unittests") {
     "//base/test:test_support",
     "//cc",
     "//services/shell/background:main",  # Provides main().
+    "//services/ui/ime/test_ime_driver",
     "//services/ui/public/cpp",
     "//services/ui/public/cpp/tests:unittest_support",
     "//services/ui/public/interfaces",