Add MockInputMethodManager under ui/base/ime/chromeos/

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/buildflag_header.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
@@ skipping 655 matching lines @@
       "test/ios/ui_view_test_utils.mm",
     ]
   }
 
   if (is_mac) {
     sources += [ "test/user_interactive_test_case_mac.mm" ]
   } else {
     sources += [ "test/user_interactive_test_case.cc" ]
   }
 
+  if (is_chromeos) {
+    sources += [
+      "ime/chromeos/mock_input_method_manager.cc",
+      "ime/chromeos/mock_input_method_manager.h",
+    ]
+  }
+
   public_deps = [
     ":base",
   ]
   deps = [
     "//base",
     "//base/test:test_config",
     "//skia",
     "//testing/gtest",
     "//ui/base:ui_data_pack",
     "//ui/events:events_base",
@@ skipping 281 matching lines @@
 if (is_mac) {
   mac_framework_bundle("ui_unittests_framework") {
     testonly = true
     deps = [
       "//ui/resources:ui_test_pak_bundle_data",
     ]
     info_plist = "test/framework-Info.plist"
     output_name = "ui_unittests Framework"
   }
 }