Change chrome://proximity-auth to use RemoteDeviceLifeCycle.

components/proximity_auth/remote_device_life_cycle_impl.cc

 // 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.
 
 #include "components/proximity_auth/remote_device_life_cycle_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/time/default_tick_clock.h"
@@ skipping 77 matching lines @@
 }
 
 scoped_ptr<Authenticator> RemoteDeviceLifeCycleImpl::CreateAuthenticator() {
   return make_scoped_ptr(new DeviceToDeviceAuthenticator(
       connection_.get(), proximity_auth_client_->GetAccountId(),
       proximity_auth_client_->CreateSecureMessageDelegate()));
 }
 
 void RemoteDeviceLifeCycleImpl::TransitionToState(
     RemoteDeviceLifeCycle::State new_state) {
+  PA_LOG(INFO) << "Life cycle transition: " << static_cast<int>(state_)
+               << " => " << static_cast<int>(new_state);
   RemoteDeviceLifeCycle::State old_state = state_;
   state_ = new_state;
   FOR_EACH_OBSERVER(Observer, observers_,
                     OnLifeCycleStateChanged(old_state, new_state));
 }
 
 void RemoteDeviceLifeCycleImpl::FindConnection() {
   connection_finder_ = CreateConnectionFinder();
   connection_finder_->Find(
       base::Bind(&RemoteDeviceLifeCycleImpl::OnConnectionFound,
@@ skipping 47 matching lines @@
 
   TransitionToState(RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
 }
 
 void RemoteDeviceLifeCycleImpl::OnDisconnected() {
   DCHECK(state_ == RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
   FindConnection();
 }
 
 }  // namespace proximity_auth