[Easy Unlock] Port the BluetoothThrottler class to native code.

components/proximity_auth/bluetooth_connection_finder.cc

 // 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.
 
 #include "components/proximity_auth/bluetooth_connection_finder.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 101 matching lines @@
                                                       bool present) {
   PollIfReady();
 }
 
 void BluetoothConnectionFinder::AdapterPoweredChanged(BluetoothAdapter* adapter,
                                                       bool powered) {
   PollIfReady();
 }
 
 void BluetoothConnectionFinder::OnConnectionStatusChanged(
-    const Connection& connection,
+    Connection* connection,
     Connection::Status old_status,
     Connection::Status new_status) {
-  DCHECK_EQ(&connection, connection_.get());
+  DCHECK_EQ(connection, connection_.get());
 
   if (connection_->IsConnected()) {
     base::TimeDelta elapsed = base::TimeTicks::Now() - start_time_;
     VLOG(1) << "[BCF] Connection found! Elapsed Time: "
             << elapsed.InMilliseconds() << "ms.";
     UnregisterAsObserver();
     connection_callback_.Run(connection_.Pass());
   } else if (old_status == Connection::IN_PROGRESS) {
     VLOG(1) << "[BCF] Connection failed! Scheduling another polling iteration.";
     connection_.reset();
     has_delayed_poll_scheduled_ = true;
     base::MessageLoopProxy::current()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&BluetoothConnectionFinder::DelayedPollIfReady,
                    weak_ptr_factory_.GetWeakPtr()),
         polling_interval_);
   }
 }
 
 }  // namespace proximity_auth