Lo-Fi snackbar should only be shown for the first q=low response of a page

components/data_reduction_proxy/core/common/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("//chrome/version.gni")
 
 # Variables:
 #   deps: Extra dependencies.
 template("common_tmpl") {
   source_set(target_name) {
     sources = [
       "data_reduction_proxy_bypass_action_list.h",
       "data_reduction_proxy_bypass_type_list.h",
       "data_reduction_proxy_client_config_parser.cc",
       "data_reduction_proxy_client_config_parser.h",
       "data_reduction_proxy_config_values.h",
       "data_reduction_proxy_event_creator.cc",
       "data_reduction_proxy_event_creator.h",
       "data_reduction_proxy_event_storage_delegate.h",
       "data_reduction_proxy_event_store.cc",
       "data_reduction_proxy_event_store.h",
       "data_reduction_proxy_headers.cc",
       "data_reduction_proxy_headers.h",
       "data_reduction_proxy_params.cc",
       "data_reduction_proxy_params.h",
       "data_reduction_proxy_pref_names.cc",
       "data_reduction_proxy_pref_names.h",
       "data_reduction_proxy_switches.cc",
       "data_reduction_proxy_switches.h",
+      "lofi_decider.h",
+      "lofi_ui_service.h",
     ]
 
     public_deps = [
       ":version_header",
     ]
     deps = [
       "//base",
       "//components/data_reduction_proxy/proto:data_reduction_proxy_proto",
       "//components/variations",
     ]
@@ skipping 65 matching lines @@
     "//components/variations",
     "//net:test_support",
     "//testing/gtest",
   ]
 }
 
 process_version("version_header") {
   template_file = "version.h.in"
   output = "$target_gen_dir/version.h"
 }