Persist broken and recently-broken alt-svcs to prefs in HttpServerPropertiesManager

net/http/http_server_properties.h

Index: net/http/http_server_properties.h
diff --git a/net/http/http_server_properties.h b/net/http/http_server_properties.h
index c521148b8cc73f5df1dffd5ecf7054e68e01cbf9..393c5087812b3e8ff43673573dac793398579bba 100644
--- a/net/http/http_server_properties.h
+++ b/net/http/http_server_properties.h
@@ -103,6 +103,7 @@ struct NET_EXPORT AlternativeService {
            std::tie(other.protocol, other.host, other.port);
   }
 
+  // Output format: "protocol host:port", e.g. "h2 www.google.com:1234".
   std::string ToString() const;
 
   NextProto protocol;
@@ -114,6 +115,12 @@ NET_EXPORT_PRIVATE std::ostream& operator<<(
     std::ostream& os,
     const AlternativeService& alternative_service);
 
+struct AlternativeServiceHash {
+  size_t operator()(const net::AlternativeService& entry) const {
+    return entry.protocol ^ std::hash<std::string>()(entry.host) ^ entry.port;
+  }
+};
+
 class NET_EXPORT_PRIVATE AlternativeServiceInfo {
  public:
   AlternativeServiceInfo();