[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 2161a2d448e57000c362432ca84115e0b4ed2869..a7cec81c21aeb8a8af3005a79854c0adb92abe4e 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -921,6 +921,8 @@ source_set("chromeos") {
     "net/network_portal_web_dialog.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",
@@ -1467,6 +1469,7 @@ source_set("unit_tests") {
     "net/network_portal_detector_impl_unittest.cc",
     "net/network_portal_notification_controller_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",