[Re-land] Add network throttling as enterprise policy

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index e30168470c155b08e59976e30d7a86be7825c16c..07c8cf525754d051fd69ad841e143d2b897b95f5 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -924,6 +924,8 @@ source_set("chromeos") {
     "net/network_pref_state_observer.h",
     "net/network_state_notifier.cc",
     "net/network_state_notifier.h",
+    "net/network_throttling_observer.cc",
+    "net/network_throttling_observer.h",
     "net/shill_error.cc",
     "net/shill_error.h",
     "net/wake_on_wifi_connection_observer.cc",
@@ -1483,6 +1485,7 @@ source_set("unit_tests") {
     "net/network_portal_notification_controller_unittest.cc",
     "net/network_pref_state_observer_unittest.cc",
     "net/network_state_notifier_unittest.cc",
+    "net/network_throttling_observer_unittest.cc",
     "net/wake_on_wifi_manager_unittest.cc",
     "options/network_property_ui_data_unittest.cc",
     "ownership/fake_owner_settings_service.cc",