Using API key specified from js

components/copresence/public/copresence_client_delegate.h

 // Copyright 2014 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_COPRESENCE_PUBLIC_COPRESENCE_CLIENT_DELEGATE_H_
 #define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CLIENT_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace copresence {
 
+class DeviceFingerprint;
 class Message;
 class WhispernetClient;
 
 enum CopresenceStatus { SUCCESS, FAIL };
 
 // Callback type to send a status.
 typedef base::Callback<void(CopresenceStatus)> StatusCallback;
 
 // A delegate interface for users of Copresence.
 class CopresenceClientDelegate {
  public:
   // This method will be called when we have subscribed messages that need to
   // be sent to their respective apps.
   virtual void HandleMessages(
       const std::string& app_id,
       const std::string& subscription_id,
       const std::vector<Message>& message) = 0;
 
   virtual net::URLRequestContextGetter* GetRequestContext() const = 0;
-
-  virtual const std::string GetPlatformVersionString() const = 0;
+  virtual const DeviceFingerprint& GetDeviceFingerprint() const = 0;
+  virtual const std::string& GetAPIKey() const = 0;
 
   virtual WhispernetClient* GetWhispernetClient() = 0;
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CLIENT_DELEGATE_H_