[signin] Add DICe flow for account consistency requests.

components/signin/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.
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 static_library("browser") {
   sources = [
@@ skipping 14 matching lines @@
     "account_tracker_service.cc",
     "account_tracker_service.h",
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "child_account_info_fetcher.cc",
     "child_account_info_fetcher.h",
     "child_account_info_fetcher_android.cc",
     "child_account_info_fetcher_android.h",
     "child_account_info_fetcher_impl.cc",
     "child_account_info_fetcher_impl.h",
+    "chrome_connected_header_helper.cc",
+    "chrome_connected_header_helper.h",
+    "dice_header_helper.cc",
+    "dice_header_helper.h",
     "gaia_cookie_manager_service.cc",
     "gaia_cookie_manager_service.h",
     "profile_identity_provider.cc",
     "profile_identity_provider.h",
     "profile_oauth2_token_service.cc",
     "profile_oauth2_token_service.h",
     "refresh_token_annotation_request.cc",
     "refresh_token_annotation_request.h",
     "signin_client.cc",
     "signin_client.h",
@@ skipping 55 matching lines @@
   ]
 
   if (is_chromeos) {
     sources -= [
       "signin_manager.cc",
       "signin_status_metrics_provider.cc",
       "signin_status_metrics_provider_delegate.cc",
     ]
   }
 
+  if (is_android || is_ios) {
+    sources -= [
+      "dice_header_helper.cc",
+      "dice_header_helper.h",
+    ]
+  }
+
   if (is_android) {
     sources -= [
       "child_account_info_fetcher_impl.cc",
       "child_account_info_fetcher_impl.h",
     ]
     deps += [ "android:jni_headers" ]
   }
 }
 
 static_library("test_support") {
@@ skipping 59 matching lines @@
   }
 }
 
 if (is_android) {
   java_cpp_enum("investigated_scenario_java") {
     sources = [
       "signin_investigator.h",
     ]
   }
 }