hw: sensors: Add gyro field

Change-Id: I113f0a067fccbc8d69d1949b6af3ed9e119d0355
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

include/hardware/sensors.h

@@ -212,6 +212,13 @@ __BEGIN_DECLS
  *
  * Pressure sensors report events at a constant rate defined by setDelay().
  *
+ * Gyro
+ * --------
+ *
+ * The gyroscope sensor values are returned in degrees per second (dps)
+ *
+ * Gyroscope sensor report events at a constant rate defined by setDelay().
+ *
  */
 typedef struct {
     union {
@@ -263,6 +270,9 @@ typedef struct sensors_event_t {
         /* orientation values are in degrees */
         sensors_vec_t   orientation;
 
+	/* angular velocity in degrees per second (dps) */
+	sensors_vec_t   gyro;
+
         /* temperature is in degrees centigrade (Celsius) */
         float           temperature;