Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/protocol/connection_to_host.h

 // Copyright (c) 2012 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 REMOTING_PROTOCOL_CONNECTION_TO_HOST_H_
 #define REMOTING_PROTOCOL_CONNECTION_TO_HOST_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 28 matching lines @@
   // update these locations if you make any changes to the ordering.
   enum State {
     INITIALIZING,
     CONNECTING,
     AUTHENTICATED,
     CONNECTED,
     FAILED,
     CLOSED,
   };
 
+  // Returns the literal string of |state|.
+  static const char* StateToString(State state);
+
   class HostEventCallback {
    public:
     virtual ~HostEventCallback() {}
 
     // Called when state of the connection changes.
     virtual void OnConnectionState(State state, ErrorCode error) = 0;
 
     // Called when ready state of the connection changes. When |ready|
     // is set to false some data sent by the peers may be
     // delayed. This is used to indicate in the UI when connection is
@@ skipping 44 matching lines @@
   virtual InputStub* input_stub() = 0;
 
   // Return the current state of ConnectionToHost.
   virtual State state() const = 0;
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CONNECTION_TO_HOST_H_