[CrOS Tether] ProximityAuth WebUI improvement: show the local device's ID.

chrome/browser/signin/chrome_proximity_auth_client.h

 // Copyright 2015 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_SIGNIN_CHROME_PROXIMITY_AUTH_CLIENT_H_
 #define CHROME_BROWSER_SIGNIN_CHROME_PROXIMITY_AUTH_CLIENT_H_
 
 #include "base/macros.h"
 #include "components/proximity_auth/proximity_auth_client.h"
 
@@ skipping 24 matching lines @@
   std::string GetAccountId() override;
   cryptauth::CryptAuthEnrollmentManager* GetCryptAuthEnrollmentManager()
       override;
   cryptauth::CryptAuthDeviceManager* GetCryptAuthDeviceManager() override;
   void FinalizeSignin(const std::string& secret) override;
   void GetChallengeForUserAndDevice(
       const std::string& user_id,
       const std::string& remote_public_key,
       const std::string& nonce,
       base::Callback<void(const std::string& challenge)> callback) override;
+  std::string GetLocalDevicePublicKey() override;
 
  private:
   cryptauth::CryptAuthService* GetCryptAuthService();
 
   Profile* const profile_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeProximityAuthClient);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_CHROME_PROXIMITY_AUTH_CLIENT_H_