Revert of Revert of Adding CopresenceState

components/copresence/public/copresence_manager.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_MANAGER_H_
 #define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_MANAGER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "components/copresence/public/copresence_delegate.h"
 
 namespace copresence {
 
+class CopresenceState;
 class ReportRequest;
 
 // The CopresenceManager class is the central interface for Copresence
 // functionality. This class handles all the initialization and delegation
 // of copresence tasks. Any user of copresence only needs to interact
 // with this class.
 class CopresenceManager {
  public:
   CopresenceManager() {}
   virtual ~CopresenceManager() {}
 
+  // Accessor for the CopresenceState instance that tracks debug info.
+  virtual CopresenceState* state() = 0;
+
   // This method will execute a report request. Each report request can have
   // multiple (un)publishes, (un)subscribes. This will ensure that once the
   // manager is initialized, it sends all request to the server and handles
   // the response. If an error is encountered, the status callback is used
   // to relay it to the requester.
   virtual void ExecuteReportRequest(const ReportRequest& request,
                                     const std::string& app_id,
                                     const std::string& auth_token,
                                     const StatusCallback& callback) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CopresenceManager);
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_MANAGER_H_