[Re-land] Add network throttling as enterprise policy

chromeos/network/network_state_handler.h

Index: chromeos/network/network_state_handler.h
diff --git a/chromeos/network/network_state_handler.h b/chromeos/network/network_state_handler.h
index c3df34455630b05ede7cb0379c2c455d537c9597..62b375838f817fea939c5146f4055deca632be98 100644
--- a/chromeos/network/network_state_handler.h
+++ b/chromeos/network/network_state_handler.h
@@ -225,6 +225,14 @@ class CHROMEOS_EXPORT NetworkStateHandler
   // only set it.
   void SetWakeOnLanEnabled(bool enabled);
 
+  // Enable or disable network bandwidth throttling, on all interfaces on the
+  // system. If |enabled| is true, |upload_rate_kbits| and |download_rate_kbits|
+  // are the desired rates (in kbits/s) to throttle to. If |enabled| is false,
+  // throttling is off, and the rates are ignored.
+  void SetNetworkThrottlingStatus(bool enabled,
+                                  uint32_t upload_rate_kbits,
+                                  uint32_t download_rate_kbits);
+
   const std::string& GetCheckPortalListForTest() const {
     return check_portal_list_;
   }