Added VLOG(1) loggings to mdns extensions API code

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

Index: chrome/browser/extensions/api/mdns/dns_sd_registry.cc
diff --git a/chrome/browser/extensions/api/mdns/dns_sd_registry.cc b/chrome/browser/extensions/api/mdns/dns_sd_registry.cc
index 78a68954a22f523615d43ccb7c17cf39ca30d5f0..40966e545e3747a5b41a9a6b736058d874ffdd8d 100644
--- a/chrome/browser/extensions/api/mdns/dns_sd_registry.cc
+++ b/chrome/browser/extensions/api/mdns/dns_sd_registry.cc
@@ -54,16 +54,26 @@ bool DnsSdRegistry::ServiceTypeData::UpdateService(
   // Set to true when a service is updated in or added to the registry.
   bool updated_or_added = added;
   if (it != service_list_.end()) {
+    VLOG(1) << "Found service in cache: " << service.service_name;
     // If added == true, but we still found the service in our cache, then just
     // update the existing entry, but this should not happen!
     DCHECK(!added);
     if (*it != service) {
+      VLOG(1) << "Service in cache was different, updating: "
+              << service.service_name;
       *it = service;
       updated_or_added = true;
     }
   } else if (added) {
+    VLOG(1) << "Service not found in cache, adding: " << service.service_name;
     service_list_.push_back(service);
+  } else {
+    VLOG(1) << "Service not found in cache but claims added == false, "
+            << "this should not happen?: " << service.service_name;
   }
+
+  VLOG(1) << "Updated or added service: " << service.service_name << "? : "
+          << updated_or_added;
   return updated_or_added;
 };
 
@@ -120,15 +130,20 @@ DnsSdDeviceLister* DnsSdRegistry::CreateDnsSdDeviceLister(
 }
 
 void DnsSdRegistry::RegisterDnsSdListener(std::string service_type) {
+  VLOG(1) << "Registering listener of service type: " << service_type;
   if (service_type.empty())
     return;
 
   if (IsRegistered(service_type)) {
+    VLOG(1) << "Service type " << service_type
+            << " was already registered; adding "
+            << "listener and dispatching event";
     service_data_map_[service_type]->ListenerAdded();
     DispatchApiEvent(service_type);
     return;
   }
 
+  VLOG(1) << "Creating DnsSdDeviceLister and discovering and dispatching event";
   scoped_ptr<DnsSdDeviceLister> dns_sd_device_lister(CreateDnsSdDeviceLister(
       this, service_type, service_discovery_client_));
   dns_sd_device_lister->Discover(false);
@@ -139,6 +154,7 @@ void DnsSdRegistry::RegisterDnsSdListener(std::string service_type) {
 }
 
 void DnsSdRegistry::UnregisterDnsSdListener(std::string service_type) {
+  VLOG(1) << "Unregistering listener of service type: " << service_type;
   DnsSdRegistry::DnsSdServiceTypeDataMap::iterator it =
       service_data_map_.find(service_type);
   if (it == service_data_map_.end())
@@ -151,11 +167,17 @@ void DnsSdRegistry::UnregisterDnsSdListener(std::string service_type) {
 void DnsSdRegistry::ServiceChanged(const std::string& service_type,
                                    bool added,
                                    const DnsSdService& service) {
-  if (!IsRegistered(service_type))
+  if (!IsRegistered(service_type)) {
+    VLOG(1) << "ServiceChanged: Service type: " << service_type
+            << " not registered; ignoring"; 
     return;
+  }
 
-  VLOG(1) << "Service changed: " << service.service_name;
+  VLOG(1) << "Service changed: " << service.service_name 
+          << ", added? " << added;
   if (service_data_map_[service_type]->UpdateService(added, service)) {
+    VLOG(1) << "Updated service and dispatching event for service type: " 
+            << service_type;
     DispatchApiEvent(service_type);
   } else {
     VLOG(1) << "Failed to find existing service to update: "
@@ -165,11 +187,16 @@ void DnsSdRegistry::ServiceChanged(const std::string& service_type,
 
 void DnsSdRegistry::ServiceRemoved(const std::string& service_type,
                                    const std::string& service_name) {
-  if (!IsRegistered(service_type))
+  if (!IsRegistered(service_type)) {
+    VLOG(1) << "ServiceRemoved: Service type: " << service_type
+            << " not registered; ignoring"; 
     return;
+  }
 
-  VLOG(1) << "Removing service: " << service_name;
+  VLOG(1) << "Service removed: " << service_name;
   if (service_data_map_[service_type]->RemoveService(service_name)) {
+    VLOG(1) << "Removed service and dispatching event for service type: "
+            << service_type;
     DispatchApiEvent(service_type);
   } else {
     VLOG(1) << "Failed to remove service: " << service_name;
@@ -177,16 +204,27 @@ void DnsSdRegistry::ServiceRemoved(const std::string& service_type,
 }
 
 void DnsSdRegistry::ServicesFlushed(const std::string& service_type) {
-  if (!IsRegistered(service_type))
+  if (!IsRegistered(service_type)) {
+    VLOG(1) << "ServicesFlushed: Service type: " << service_type
+            << " not registered; ignoring"; 
     return;
+  }
 
-  if (service_data_map_[service_type]->ClearServices())
+  VLOG(1) << "Service type flushed: " << service_type;
+  if (service_data_map_[service_type]->ClearServices()) {
+    VLOG(1) << "Cleared services and dispatching event for service type: "
+            << service_type;
     DispatchApiEvent(service_type);
+  } else {
+    VLOG(1) << "Failed to clear services for service type: " << service_type;
+  }
 }
 
 void DnsSdRegistry::DispatchApiEvent(const std::string& service_type) {
   // TODO(justinlin): Make this MaybeDispatchApiEvent instead and dispatch if a
   // dirty bit is set.
+  VLOG(1) << "Calling observers OnDnsSdEvent with service type: "
+          << service_type;
   FOR_EACH_OBSERVER(DnsSdObserver, observers_, OnDnsSdEvent(
       service_type, service_data_map_[service_type]->GetServiceList()));
 }