Revert of Remove remote tree host and some related input and metro_driver code

ui/base/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("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
@@ skipping 725 matching lines @@
     ]
   }
 
   if (build_ime) {
     sources += [
       "ime/candidate_window_unittest.cc",
       "ime/chromeos/character_composer_unittest.cc",
       "ime/composition_text_unittest.cc",
       "ime/input_method_base_unittest.cc",
       "ime/input_method_chromeos_unittest.cc",
+      "ime/remote_input_method_win_unittest.cc",
       "ime/win/imm32_manager_unittest.cc",
       "ime/win/tsf_input_scope_unittest.cc",
     ]
     if (is_linux && use_aura && !is_chromeos) {
       sources += [ "ime/input_method_auralinux_unittest.cc" ]
     }
     if (is_mac) {
       sources += [ "resource/resource_bundle_mac_unittest.mm" ]
     }
     if (use_x11) {
@@ skipping 136 matching lines @@
   }
   if (is_mac) {
     data += [ "$root_out_dir/ui_unittests Framework.framework/" ]
 
     if (is_asan && symbol_level == 0) {
       data += [ "$root_out_dir/ui_base_unittests.dSYM/" ]
     }
   }
 }
 # TODO(GYP) Mac (ui_base_tests_bundle)