Revert of Move //device/generic_sensor to be part of the internal implementation of the Device Service.

device/generic_sensor/generic_sensor_consts.h

Index: device/generic_sensor/generic_sensor_consts.h
diff --git a/device/generic_sensor/generic_sensor_consts.h b/device/generic_sensor/generic_sensor_consts.h
new file mode 100644
index 0000000000000000000000000000000000000000..ca9b45a4cd1ae78c73cfc9fcb1bc53970b23e9b2
--- /dev/null
+++ b/device/generic_sensor/generic_sensor_consts.h
@@ -0,0 +1,39 @@
+// 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.
+
+#ifndef DEVICE_GENERIC_SENSOR_GENERIC_SENSOR_CONSTS_H_
+#define DEVICE_GENERIC_SENSOR_GENERIC_SENSOR_CONSTS_H_
+
+#define _USE_MATH_DEFINES
+#include <math.h>
+
+namespace device {
+
+// Required for conversion from G/s^2 to m/s^2
+constexpr double kMeanGravity = 9.80665;
+
+// Required for conversion from deg to rad
+constexpr double kRadiansInDegrees = M_PI / 180.0;
+
+// Required for conversion from Gauss to uT.
+constexpr double kMicroteslaInGauss = 100.0;
+
+// Required for conversion from Milligauss to Microtesla.
+constexpr double kMicroteslaInMilligauss = 0.1;
+
+// Default rate for returning value of the ambient light sensor.
+constexpr int kDefaultAmbientLightFrequencyHz = 5;
+
+// Default rate for returning value of the accelerometer sensor.
+constexpr int kDefaultAccelerometerFrequencyHz = 10;
+
+// Default rate for returning value of the gyroscope sensor.
+constexpr int kDefaultGyroscopeFrequencyHz = 10;
+
+// Default rate for returning value of the magnetometer sensor.
+constexpr int kDefaultMagnetometerFrequencyHz = 10;
+
+}  // namespace device
+
+#endif  // DEVICE_GENERIC_SENSOR_GENERIC_SENSOR_CONSTS_H_