Adding DRP specfic UMA for FirstContentfulPaint

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 2e35b4c538725738516e4973217286b1b3562f57..e8e5176af9d77c8f440a5a6eea6d9a409761f48b 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -150,20 +150,21 @@
       'browser/net/net_error_tab_helper_unittest.cc',
       'browser/net/predictor_unittest.cc',
       'browser/net/probe_message_unittest.cc',
       'browser/net/quota_policy_channel_id_store_unittest.cc',
       'browser/net/safe_search_util_unittest.cc',
       'browser/net/spdyproxy/data_reduction_proxy_chrome_settings_unittest.cc',
       'browser/net/spdyproxy/data_reduction_proxy_settings_unittest_android.cc',
       'browser/net/url_info_unittest.cc',
       'browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc',
       'browser/page_load_metrics/observers/core_page_load_metrics_observer_unittest.cc',
+      'browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc',
       'browser/page_load_metrics/observers/document_write_page_load_metrics_observer_unittest.cc',
       'browser/page_load_metrics/observers/from_gws_page_load_metrics_observer_unittest.cc',
       'browser/page_load_metrics/observers/google_captcha_observer_unittest.cc',
       'browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc',
       'browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h',
       'browser/password_manager/chrome_password_manager_client_unittest.cc',
       'browser/password_manager/password_manager_internals_service_unittest.cc',
       'browser/password_manager/password_store_mac_unittest.cc',
       'browser/password_manager/password_store_proxy_mac_unittest.cc',
       'browser/password_manager/password_store_win_unittest.cc',
@@ -208,21 +209,23 @@
       'browser/profiles/profile_downloader_unittest.cc',
       'browser/profiles/profile_info_cache_unittest.cc',
       'browser/profiles/profile_info_cache_unittest.h',
       'browser/profiles/profile_manager_unittest.cc',
       'browser/profiles/profile_shortcut_manager_unittest_win.cc',
       'browser/push_messaging/background_budget_service_unittest.cc',
       'browser/push_messaging/push_messaging_app_identifier_unittest.cc',
       'browser/push_messaging/push_messaging_notification_manager_unittest.cc',
       'browser/push_messaging/push_messaging_permission_context_unittest.cc',
       'browser/push_messaging/push_messaging_service_unittest.cc',
+      'browser/renderer_host/chrome_navigation_data_unittest.cc',
       'browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper_unit_test.mm',
+      'browser/renderer_host/chrome_resource_dispatcher_host_delegate_unittest.cc',
       'browser/resources_util_unittest.cc',
       'browser/search/contextual_search_policy_handler_android_unittest.cc',
       'browser/search/iframe_source_unittest.cc',
       'browser/search/thumbnail_source_unittest.cc',
       'browser/search_engines/search_provider_install_data_unittest.cc',
 
       # TODO(hashimoto): those tests should be componentized and moved to
       # //components:components_unittests, http://crbug.com/527882.
       'browser/search_engines/template_url_fetcher_unittest.cc',
       'browser/search_engines/template_url_parser_unittest.cc',