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diff --git a/chromium/net/third_party/quiche/src/quiche/quic/masque/masque_client.h b/chromium/net/third_party/quiche/src/quiche/quic/masque/masque_client.h
new file mode 100644
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+++ b/chromium/net/third_party/quiche/src/quiche/quic/masque/masque_client.h
@@ -0,0 +1,67 @@
+// Copyright 2019 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 QUICHE_QUIC_MASQUE_MASQUE_CLIENT_H_
+#define QUICHE_QUIC_MASQUE_MASQUE_CLIENT_H_
+
+#include <string>
+
+#include "quiche/quic/core/io/quic_event_loop.h"
+#include "quiche/quic/masque/masque_client_session.h"
+#include "quiche/quic/masque/masque_utils.h"
+#include "quiche/quic/platform/api/quic_export.h"
+#include "quiche/quic/tools/quic_default_client.h"
+
+namespace quic {
+
+// QUIC client that implements MASQUE.
+class QUIC_NO_EXPORT MasqueClient : public QuicDefaultClient,
+                                    public MasqueClientSession::Owner {
+ public:
+  // Constructs a MasqueClient, performs a synchronous DNS lookup.
+  static std::unique_ptr<MasqueClient> Create(
+      const std::string& uri_template, MasqueMode masque_mode,
+      QuicEventLoop* event_loop, std::unique_ptr<ProofVerifier> proof_verifier);
+
+  // From QuicClient.
+  std::unique_ptr<QuicSession> CreateQuicClientSession(
+      const ParsedQuicVersionVector& supported_versions,
+      QuicConnection* connection) override;
+
+  // Client session for this client.
+  MasqueClientSession* masque_client_session();
+
+  // Convenience accessor for the underlying connection ID.
+  QuicConnectionId connection_id();
+
+  // From MasqueClientSession::Owner.
+  void OnSettingsReceived() override;
+
+  MasqueMode masque_mode() const { return masque_mode_; }
+
+ private:
+  // Constructor is private, use Create() instead.
+  MasqueClient(QuicSocketAddress server_address, const QuicServerId& server_id,
+               MasqueMode masque_mode, QuicEventLoop* event_loop,
+               std::unique_ptr<ProofVerifier> proof_verifier,
+               const std::string& uri_template);
+
+  // Wait synchronously until we receive the peer's settings. Returns whether
+  // they were received.
+  bool WaitUntilSettingsReceived();
+
+  std::string authority() const;
+
+  // Disallow copy and assign.
+  MasqueClient(const MasqueClient&) = delete;
+  MasqueClient& operator=(const MasqueClient&) = delete;
+
+  MasqueMode masque_mode_;
+  std::string uri_template_;
+  bool settings_received_ = false;
+};
+
+}  // namespace quic
+
+#endif  // QUICHE_QUIC_MASQUE_MASQUE_CLIENT_H_