Implement DeviceMotionEvent API

chromeos/accelerometer/accelerometer_reader.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 "chromeos/accelerometer/accelerometer_reader.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 193 matching lines @@
 void AccelerometerReader::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
   if (has_update_)
     observer->OnAccelerometerUpdated(update_);
 }
 
 void AccelerometerReader::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
+bool AccelerometerReader::HasObserver(Observer* observer) {
+  return observers_.HasObserver(observer);
+}
+
 AccelerometerReader::AccelerometerReader()
     : has_update_(false),
       configuration_(new AccelerometerReader::Configuration()),
       weak_factory_(this) {
 }
 
 AccelerometerReader::~AccelerometerReader() {
 }
 
 void AccelerometerReader::OnInitialized(
@@ skipping 42 matching lines @@
 
   // Trigger another read after the current sampling delay.
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&AccelerometerReader::TriggerRead,
                  weak_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(kDelayBetweenReadsMs));
 }
 
 }  // namespace chromeos