[NetInfo] Add MaxBandwidthChanged notification and implement on Android

net/android/network_change_notifier_android.cc

Index: net/android/network_change_notifier_android.cc
diff --git a/net/android/network_change_notifier_android.cc b/net/android/network_change_notifier_android.cc
index 2063e7b017236f549afa1eec9ac88d4829d293d7..0a109b81fac1b210daf214f6949b6fe68ec910f2 100644
--- a/net/android/network_change_notifier_android.cc
+++ b/net/android/network_change_notifier_android.cc
@@ -122,6 +122,12 @@ void NetworkChangeNotifierAndroid::OnConnectionTypeChanged() {
   DnsConfigServiceThread::NotifyNetworkChangeNotifierObservers();
 }
 
+void NetworkChangeNotifierAndroid::OnMaxBandwidthChanged(
+    double max_bandwidth_mbps) {
+  NetworkChangeNotifier::NotifyObserversOfMaxBandwidthChange(
+      max_bandwidth_mbps);
+}
+
 // static
 bool NetworkChangeNotifierAndroid::Register(JNIEnv* env) {
   return NetworkChangeNotifierDelegateAndroid::Register(env);