chromeos: Move InputMethodUtil into //ui/base/ime/chromeos

ui/base/BUILD.gn

Index: ui/base/BUILD.gn
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index 05cb33baac5cd928c06cdca8923e9ea1fe4718ca..741d8561ad05434633faf728b957aa4cda2b93d8 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -686,13 +686,6 @@ static_library("test_support") {
     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",
   ]
@@ -722,6 +715,19 @@ static_library("test_support") {
     ]
   }
 
+  if (is_chromeos) {
+    sources += [
+      "ime/chromeos/input_method_whitelist.cc",
+      "ime/chromeos/input_method_whitelist.h",
+      "ime/chromeos/mock_input_method_manager.cc",
+      "ime/chromeos/mock_input_method_manager.h",
+    ]
+    deps += [
+      # Generates a header used by input_method_whitelist.cc
+      "//chromeos/ime:gencode",
+    ]
+  }
+
   if (!use_aura) {
     sources -= [
       "test/ui_controls_aura.cc",
@@ -835,6 +841,7 @@ test("ui_base_unittests") {
     sources += [
       "ime/candidate_window_unittest.cc",
       "ime/chromeos/character_composer_unittest.cc",
+      "ime/chromeos/input_method_util_unittest.cc",
       "ime/composition_text_unittest.cc",
       "ime/input_method_base_unittest.cc",
       "ime/input_method_chromeos_unittest.cc",