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diff --git a/components/autofill/content/browser/wallet/encryption_escrow_client_observer.h b/components/autofill/content/browser/wallet/encryption_escrow_client_observer.h
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+++ b/components/autofill/content/browser/wallet/encryption_escrow_client_observer.h
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+// 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 COMPONENTS_AUTOFILL_CONTENT_BROWSER_WALLET_ENCRYPTION_ESCROW_CLIENT_OBSERVER_H_
+#define COMPONENTS_AUTOFILL_CONTENT_BROWSER_WALLET_ENCRYPTION_ESCROW_CLIENT_OBSERVER_H_
+
+#include <string>
+
+namespace autofill {
+namespace wallet {
+
+// EncryptionEscrowClientObserver is to be implemented by any classes making
+// calls with EncryptionEscrowClient. The appropriate callback method will be
+// called on EncryptionEscrowClientObserver with the response from the Online
+// Wallet encryption and escrow backend.
+class EncryptionEscrowClientObserver {
+ public:
+  // Called when an EncryptOneTimePad request finishes successfully.
+  // |encrypted_one_time_pad| and |session_material| must be used when getting a
+  // FullWallet.
+  virtual void OnDidEncryptOneTimePad(const std::string& encrypted_one_time_pad,
+                                      const std::string& session_material) = 0;
+
+  // Called when an EscrowCardVerificationNumber request finishes
+  // successfully. |escrow_handle| must be used when authenticating an
+  // instrument.
+  virtual void OnDidEscrowCardVerificationNumber(
+      const std::string& escrow_handle) = 0;
+
+  // Called when an EscrowInstrumentInformation request finishes successfully.
+  // |escrow_handle| must be used when saving a new instrument.
+  virtual void OnDidEscrowInstrumentInformation(
+      const std::string& escrow_handle) = 0;
+
+  // Called when a request is made to the encryption escrow server.
+  virtual void OnDidMakeRequest() = 0;
+
+  // Called when a request fails due to a network error or if the response was
+  // invalid.
+  virtual void OnNetworkError(int response_code) = 0;
+
+  // Called when a request fails due to a malformed response.
+  virtual void OnMalformedResponse() = 0;
+
+ protected:
+  virtual ~EncryptionEscrowClientObserver() {}
+};
+
+}  // namespace wallet
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CONTENT_BROWSER_WALLET_ENCRYPTION_ESCROW_CLIENT_OBSERVER_H_