[net/dns] Isolate DnsConfigWatcher from DnsConfigService.

DnsConfigWatcher is installed at NetworkChangeNotifier and provides signals to DNSObservers.
DnsConfigService becomes a DNSObserver.

BUG=114827,114223,128166
TEST=./net_unittests --gtest_filter=DnsConfigService*

Review URL: https://chromiumcodereview.appspot.com/10377092

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137457 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 1 deletions

diff --git a/net/base/network_change_notifier_mac.h b/net/base/network_change_notifier_mac.h
index ec2bb1f..c95e952 100644
--- a/net/base/network_change_notifier_mac.h
+++ b/net/base/network_change_notifier_mac.h
@@ -24,7 +24,7 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
   NetworkChangeNotifierMac();
   virtual ~NetworkChangeNotifierMac();
 
-  // NetworkChangeNotifier implementation:
+  // NetworkChangeNotifier:
   virtual bool IsCurrentlyOffline() const OVERRIDE;
 
  private:
@@ -34,6 +34,8 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
     ONLINE = 1
   };
 
+  class DnsWatcherThread;
+
   // Forwarder just exists to keep the NetworkConfigWatcherMac API out of
   // NetworkChangeNotifierMac's public API.
   class Forwarder : public NetworkConfigWatcherMac::Delegate {
@@ -83,6 +85,9 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
   Forwarder forwarder_;
   scoped_ptr<const NetworkConfigWatcherMac> config_watcher_;
 
+  // Thread on which we can run DnsConfigWatcher, which requires TYPE_IO.
+  scoped_ptr<DnsWatcherThread> dns_watcher_thread_;
+
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierMac);
 };