bluetooth: Add basic scanning to chrome://bluetooth-internals.

device/bluetooth/discovery_session.cc

+// Copyright 2017 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 "base/bind_helpers.h"
+#include "device/bluetooth/discovery_session.h"
+
+namespace bluetooth {
+DiscoverySession::DiscoverySession(
+    std::unique_ptr<device::BluetoothDiscoverySession> session)
+    : discovery_session_(std::move(session)), weak_ptr_factory_(this) {}
+
+DiscoverySession::~DiscoverySession() {}
+
+void DiscoverySession::IsActive(const IsActiveCallback& callback) {
+  callback.Run(discovery_session_->IsActive());
+}
+
+void DiscoverySession::Stop(const StopCallback& callback) {
+  discovery_session_->Stop(
+      base::Bind(&DiscoverySession::OnStop, weak_ptr_factory_.GetWeakPtr(),
+                 callback),
+      base::Bind(&DiscoverySession::OnStopError, weak_ptr_factory_.GetWeakPtr(),
+                 callback));
+}
+
+void DiscoverySession::OnStop(const StopCallback& callback) {
+  callback.Run(true /* success */);
+}
+
+void DiscoverySession::OnStopError(const StopCallback& callback) {
+  callback.Run(false /* success */);
+}
+
+}  // namespace bluetooth