Observe IP address change in connectivity_checker.

chromecast/net/connectivity_checker.cc

Index: chromecast/net/connectivity_checker.cc
diff --git a/chromecast/net/connectivity_checker.cc b/chromecast/net/connectivity_checker.cc
index 0c78b5d93aafe782076b476bde524ff87ed95366..4047770007c67fd60db9162ad00aba9c332e3521 100644
--- a/chromecast/net/connectivity_checker.cc
+++ b/chromecast/net/connectivity_checker.cc
@@ -60,12 +60,15 @@ void ConnectivityChecker::Initialize() {
   url_request_context_.reset(builder.Build());
 
   net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
+  net::NetworkChangeNotifier::AddIPAddressObserver(this);
   loop_proxy_->PostTask(FROM_HERE,
                         base::Bind(&ConnectivityChecker::Check, this));
 }
 
 ConnectivityChecker::~ConnectivityChecker() {
   DCHECK(loop_proxy_.get());
+  net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
+  net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
   loop_proxy_->DeleteSoon(FROM_HERE, url_request_context_.release());
   loop_proxy_->DeleteSoon(FROM_HERE, url_request_.release());
 }
@@ -116,6 +119,7 @@ void ConnectivityChecker::Check() {
 
 void ConnectivityChecker::OnConnectionTypeChanged(
     net::NetworkChangeNotifier::ConnectionType type) {
+  VLOG(2) << "OnConnectionTypeChanged " << type;
   if (type == net::NetworkChangeNotifier::CONNECTION_NONE)
     SetConnectivity(false);
 
@@ -123,6 +127,13 @@ void ConnectivityChecker::OnConnectionTypeChanged(
   Check();
 }
 
+void ConnectivityChecker::OnIPAddressChanged() {
+  VLOG(2) << "OnIPAddressChanged";
+
+  Cancel();
+  Check();
+}
+
 void ConnectivityChecker::OnResponseStarted(net::URLRequest* request) {
   int http_response_code =
       (request->status().is_success() &&