[sensors] Add GetDefaultConfiguration() to generic sensor mojo interface.

device/generic_sensor/sensor_impl.cc

 // Copyright 2016 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 "device/generic_sensor/sensor_impl.h"
 
 #include <utility>
 
 namespace device {
 
@@ skipping 14 matching lines @@
 }
 
 void SensorImpl::AddConfiguration(
     const PlatformSensorConfiguration& configuration,
     const AddConfigurationCallback& callback) {
   // TODO(Mikhail): To avoid overflowing browser by repeated AddConfigs
   // (maybe limit the number of configs per client).
   callback.Run(sensor_->StartListening(this, configuration));
 }
 
+void SensorImpl::GetDefaultConfiguration(
+    const GetDefaultConfigurationCallback& callback) {
+  callback.Run(sensor_->GetDefaultConfiguration());
+}
+
 void SensorImpl::RemoveConfiguration(
     const PlatformSensorConfiguration& configuration,
     const RemoveConfigurationCallback& callback) {
   callback.Run(sensor_->StopListening(this, configuration));
 }
 
 void SensorImpl::Suspend() {
   suspended_ = true;
   sensor_->UpdateSensor();
 }
@@ skipping 13 matching lines @@
   DCHECK(!suspended_);
   if (client_)
     client_->RaiseError();
 }
 
 bool SensorImpl::IsNotificationSuspended() {
   return suspended_;
 }
 
 }  // namespace device