DriveFileSyncService listens to OnNetworkConnected event to restart synchronization

chrome/browser/sync_file_system/drive_file_sync_client.cc

Index: chrome/browser/sync_file_system/drive_file_sync_client.cc
diff --git a/chrome/browser/sync_file_system/drive_file_sync_client.cc b/chrome/browser/sync_file_system/drive_file_sync_client.cc
index f7a52f062db5457f0d4b452657ea5e0680367550..601aac8efb975af6160b606771fa217427e61f5e 100644
--- a/chrome/browser/sync_file_system/drive_file_sync_client.cc
+++ b/chrome/browser/sync_file_system/drive_file_sync_client.cc
@@ -69,6 +69,7 @@ DriveFileSyncClient::DriveFileSyncClient(Profile* profile) {
       "" /* custom_user_agent */));
   drive_service_->Initialize(profile);
   drive_service_->AddObserver(this);
+  net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 
   drive_uploader_.reset(new google_apis::DriveUploader(drive_service_.get()));
 }
@@ -88,12 +89,14 @@ DriveFileSyncClient::DriveFileSyncClient(
   drive_service_ = drive_service.Pass();
   drive_service_->Initialize(profile);
   drive_service_->AddObserver(this);
+  net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 
   drive_uploader_ = drive_uploader.Pass();
 }
 
 DriveFileSyncClient::~DriveFileSyncClient() {
   DCHECK(CalledOnValidThread());
+  net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
   drive_service_->RemoveObserver(this);
   drive_service_->CancelAll();
 }
@@ -375,6 +378,14 @@ void DriveFileSyncClient::OnReadyToPerformOperations() {
   FOR_EACH_OBSERVER(DriveFileSyncClientObserver, observers_, OnAuthenticated());
 }
 
+void DriveFileSyncClient::OnConnectionTypeChanged(
+    net::NetworkChangeNotifier::ConnectionType type) {
+  DCHECK(CalledOnValidThread());
+  if (type != net::NetworkChangeNotifier::CONNECTION_NONE)
+    FOR_EACH_OBSERVER(DriveFileSyncClientObserver,
+                      observers_, OnNetworkConnected());
+}
+
 void DriveFileSyncClient::DidGetDocumentFeedData(
     const DocumentFeedCallback& callback,
     google_apis::GDataErrorCode error,