Implement DeviceMotionEvent API

chromeos/accelerometer/accelerometer_types.h

 // 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.
 
 #ifndef CHROMEOS_ACCELEROMETER_ACCELEROMETER_TYPES_H_
 #define CHROMEOS_ACCELEROMETER_ACCELEROMETER_TYPES_H_
 
 #include "base/macros.h"
 #include "chromeos/chromeos_export.h"
 
@@ skipping 48 matching lines @@
 
   void Set(AccelerometerSource source, float x, float y, float z) {
     data_[source].present = true;
     data_[source].x = x;
     data_[source].y = y;
     data_[source].z = z;
   }
 
  protected:
   AccelerometerReading data_[ACCELEROMETER_SOURCE_COUNT];
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AccelerometerUpdate);

[flackr, 2015/02/25 23:15:17]

If this needs to be copyable, style guide says that the copy constructor should
be explicitly defined:
http://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Copyable_Mova...

Alternately, this could be passed as a ref counted object which would keep it
alive until all callbacks had consumed the value. This may be less expensive
than copying.

[jonross, 2015/03/02 15:18:10]

The threadsafe observer runs its notifies async, with no guarantees of
completion time.

Switched to using a scoped_refptr

 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_ACCELEROMETER_ACCELEROMETER_TYPES_H_