Initial chrome.mdns API.

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

Index: chrome/browser/extensions/api/mdns/dns_sd_registry.h
diff --git a/chrome/browser/extensions/api/mdns/dns_sd_registry.h b/chrome/browser/extensions/api/mdns/dns_sd_registry.h
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+++ b/chrome/browser/extensions/api/mdns/dns_sd_registry.h
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+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_
+
+#include <string>
+#include <vector>
+
+#include "base/observer_list.h"
+
+namespace extensions {
+
+// Network Service Discovery registry class for keeping track of discovered
+// network services.
+class DnsSdRegistry {
+ public:
+  typedef std::vector<std::string> DnsSdServiceList;
+
+  class DnsSdObserver {
+   public:
+    virtual void OnDnsSdEvent(const std::string& service_type,
+                              const DnsSdServiceList& services) = 0;
+
+   protected:
+    virtual ~DnsSdObserver() {}
+  };
+
+  explicit DnsSdRegistry();
+  virtual ~DnsSdRegistry();
+
+  // Observer registration for parties interested in discovery events.
+  virtual void AddObserver(DnsSdObserver* observer);
+  virtual void RemoveObserver(DnsSdObserver* observer);
+
+  // DNS-SD-related discovery functionality.
+  virtual void RegisterDnsSdListener(std::string service_type);
+  virtual void UnregisterDnsSdListener(std::string service_type);
+
+ protected:
+  ObserverList<DnsSdObserver> observers_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_