Limit number of service instances passed to onServiceList listeners.

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

Index: chrome/browser/extensions/api/mdns/mdns_api.h
diff --git a/chrome/browser/extensions/api/mdns/mdns_api.h b/chrome/browser/extensions/api/mdns/mdns_api.h
index f232d3b07b95432a04137b46d5e01da57ec901cf..bfe45c95b938d2f181a0ab4b69fe5c0ccf5af9d9 100644
--- a/chrome/browser/extensions/api/mdns/mdns_api.h
+++ b/chrome/browser/extensions/api/mdns/mdns_api.h
@@ -13,6 +13,7 @@
 #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;
@@ -78,6 +79,22 @@ class MDnsAPI : public BrowserContextKeyedAPI,
   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_