Implement Android shared memory data fetcher for Device Motion.

content/browser/device_orientation/accelerometer_mac.cc

 // Copyright (c) 2012 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 "content/browser/device_orientation/accelerometer_mac.h"
 
 #include <math.h>
 
 #include "base/logging.h"
 #include "content/browser/device_orientation/orientation.h"
 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h"
 
 namespace content {
 
+AccelerometerMac* AccelerometerMac::instance() {
+  CR_DEFINE_STATIC_LOCAL(AccelerometerMac, s_data_fetcher, ());
+  return &s_data_fetcher;
+}
+
 // Create a AccelerometerMac object and return NULL if no valid sensor found.
 DataFetcher* AccelerometerMac::Create() {
-  scoped_ptr<AccelerometerMac> accelerometer(new AccelerometerMac);
-  return accelerometer->Init() ? accelerometer.release() : NULL;
+  AccelerometerMac* accelerometer = AccelerometerMac::instance();
+  return accelerometer->Init() ? accelerometer : NULL;
 }
 
 AccelerometerMac::~AccelerometerMac() {
 }
 
 AccelerometerMac::AccelerometerMac() {
 }
 
 const DeviceData* AccelerometerMac::GetDeviceData(DeviceData::Type type) {
   if (type != DeviceData::kTypeOrientation)
@@ skipping 67 matching lines @@
   orientation->AddRef();
   return orientation.get();
 }
 
 bool AccelerometerMac::Init() {
   sudden_motion_sensor_.reset(SuddenMotionSensor::Create());
   return sudden_motion_sensor_.get() != NULL;
 }
 
 }  // namespace content