Added browser tests to test the BudgetAPI. Also added BudgetAPI to ExperimentalWebPlatformFeatures.

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 1304 matching lines @@
       "../browser/browsing_data/browsing_data_local_storage_helper_browsertest.cc",
       "../browser/browsing_data/browsing_data_remover_browsertest.cc",
       "../browser/browsing_data/browsing_data_remover_test_util.cc",
       "../browser/browsing_data/browsing_data_remover_test_util.h",
       "../browser/browsing_data/cache_counter_browsertest.cc",
       "../browser/browsing_data/conditional_cache_deletion_helper_browsertest.cc",
       "../browser/browsing_data/downloads_counter_browsertest.cc",
       "../browser/browsing_data/history_counter_browsertest.cc",
       "../browser/browsing_data/media_licenses_counter_browsertest.cc",
       "../browser/browsing_data/passwords_counter_browsertest.cc",
+      "../browser/budget_service/budget_manager_browsertest.cc",
       "../browser/chrome_content_browser_client_browsertest.cc",
       "../browser/chrome_main_browsertest.cc",
       "../browser/chrome_navigation_browsertest.cc",
       "../browser/chrome_plugin_browsertest.cc",
       "../browser/chrome_security_exploit_browsertest.cc",
       "../browser/chrome_site_per_process_browsertest.cc",
       "../browser/chrome_switches_browsertest.cc",
       "../browser/collected_cookies_browsertest.cc",
       "../browser/content_settings/content_settings_browsertest.cc",
       "../browser/crash_recovery_browsertest.cc",
@@ skipping 3662 matching lines @@
       "touch_hud",
       "ui",
     ]
 
     if (is_linux && !is_android) {
       deps += [ "//components/font_service:manifest" ]
       packaged_services += [ "font_service" ]
     }
   }
 }