Add log message to forwarder2's DeviceController when a port is unmapped.

tools/android/forwarder2/device_controller.cc

 // 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.
 
 #include "tools/android/forwarder2/device_controller.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 101 matching lines @@
         LOG(ERROR) << "Data Connection command received, but "
                    << "listener has not been set up yet for port " << port;
         // After this point it is assumed that, once we close our Adb Data
         // socket, the Adb forwarder command will propagate the closing of
         // sockets all the way to the host side.
         break;
       }
       listener->SetAdbDataSocket(socket.Pass());
       break;
     case command::UNLISTEN:
+      LOG(INFO) << "Unmapping port " << port;
       if (!listener) {
+        LOG(ERROR) << "No listener found for port " << port;
         SendCommand(command::UNLISTEN_ERROR, port, socket.get());
         break;
       }
       listeners_.erase(listener_it);
       SendCommand(command::UNLISTEN_SUCCESS, port, socket.get());
       break;
     default:
       // TODO(felipeg): add a KillAllListeners command.
       LOG(ERROR) << "Invalid command received. Port: " << port
                  << " Command: " << command;
@@ skipping 12 matching lines @@
       listener_port);
   if (listener_it == controller->listeners_.end())
     return;
   const linked_ptr<DeviceListener> listener = listener_it->second;
   // Note that the listener is removed from the map before it gets destroyed in
   // case its destructor would access the map.
   controller->listeners_.erase(listener_it);
 }
 
 }  // namespace forwarder