[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 81fc5fc12bae8a43059ccd55fb2a5bcd825cfe5f..b546893e7b88a9d0e801f791312437c1ce4b7f81 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -923,6 +923,8 @@ 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",
@@ -1482,6 +1484,7 @@ 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",