Added VLOG(1) loggings to mdns extensions API code

chrome/browser/extensions/api/mdns/dns_sd_device_lister.cc

Index: chrome/browser/extensions/api/mdns/dns_sd_device_lister.cc
diff --git a/chrome/browser/extensions/api/mdns/dns_sd_device_lister.cc b/chrome/browser/extensions/api/mdns/dns_sd_device_lister.cc
index e764dee76205152c55babcdb34e50a9280f6b7ff..d709313748b8de581f9727a7c4928f6bb5ef80f0 100644
--- a/chrome/browser/extensions/api/mdns/dns_sd_device_lister.cc
+++ b/chrome/browser/extensions/api/mdns/dns_sd_device_lister.cc
@@ -58,14 +58,23 @@ void DnsSdDeviceLister::OnDeviceChanged(
     const ServiceDescription& service_description) {
   DnsSdService service;
   FillServiceInfo(service_description, &service);
+  VLOG(1) << "OnDeviceChanged: "
+          << "service_name: " << service.service_name << ", "
+          << "added: " << added << ", "
+          << "service_type: " << device_lister_.service_type();
   delegate_->ServiceChanged(device_lister_.service_type(), added, service);
 }
 
 void DnsSdDeviceLister::OnDeviceRemoved(const std::string& service_name) {
+  VLOG(1) << "OnDeviceRemoved: "
+          << "service_name: " << service_name << ", "
+          << "service_type: " << device_lister_.service_type();
   delegate_->ServiceRemoved(device_lister_.service_type(), service_name);
 }
 
 void DnsSdDeviceLister::OnDeviceCacheFlushed() {
+  VLOG(1) << "OnDeviceCacheFlushed: "
+          << "service_type: " << device_lister_.service_type();
   delegate_->ServicesFlushed(device_lister_.service_type());
   device_lister_.DiscoverNewDevices(false);
 }