add experimental param to control the triggering threshold to default Always Translate checked

components/translate/core/browser/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/ui.gni")
 
 source_set("browser") {
   sources = [
     "language_state.cc",
     "language_state.h",
@@ skipping 31 matching lines @@
   deps = [
     "//base",
     "//base:i18n",
     "//components/data_use_measurement/core",
     "//components/language_usage_metrics",
     "//components/pref_registry",
     "//components/prefs",
     "//components/resources:components_resources",
     "//components/strings",
     "//components/translate/core/common",
+    "//components/variations",
     "//google_apis",
     "//net",
     "//third_party/icu",
     "//ui/base",
     "//url",
   ]
 
   if (!use_aura) {
     sources += [
       "translate_infobar_delegate.cc",
@@ skipping 23 matching lines @@
     "translate_script_unittest.cc",
     "translate_ui_delegate_unittest.cc",
   ]
   deps = [
     ":browser",
     "//base",
     "//components/infobars/core",
     "//components/pref_registry:test_support",
     "//components/prefs",
     "//components/translate/core/common",
+    "//components/variations",
     "//net:test_support",
     "//testing/gtest",
   ]
 }