Limit number of service instances passed to onServiceList listeners.

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

 // Copyright 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_MDNS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_
 
 #include <set>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "chrome/browser/extensions/api/mdns/dns_sd_registry.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_function.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 class DnsSdRegistry;
 
 // MDnsAPI is instantiated with the profile and will listen for extensions that
@@ skipping 45 matching lines @@
   base::ThreadChecker thread_checker_;
   content::BrowserContext* const browser_context_;
   // Lazily created on first access and destroyed with this API class.
   scoped_ptr<DnsSdRegistry> dns_sd_registry_;
   // Current set of service types registered with the registry.
   std::set<std::string> service_types_;
 
   DISALLOW_COPY_AND_ASSIGN(MDnsAPI);
 };
 
+// Implementation of mdns.getMaxServiceInstancesPerEventFunction, which is a
+// function for determining the maximum number of services that will be
+// available in an mdns.onServiceList event.
+class MdnsGetMaxServiceInstancesPerEventFunction :
+      public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("mdns.getMaxServiceInstancesPerEvent",
+                             MDNS_GET_MAX_SERVICE_INSTANCES_PER_EVENT);
+
+  MdnsGetMaxServiceInstancesPerEventFunction() {}
+  ExtensionFunction::ResponseAction Run() override;
+
+ protected:
+  ~MdnsGetMaxServiceInstancesPerEventFunction() override {}
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_MDNS_API_H_