Add the chrome.bluetoothLowEnergy.setAdvertisingInterval API.

device/bluetooth/bluetooth_advertisement.h

Index: device/bluetooth/bluetooth_advertisement.h
diff --git a/device/bluetooth/bluetooth_advertisement.h b/device/bluetooth/bluetooth_advertisement.h
index ebd9ee8fd12c92ad0a58243431da27aaa17f9d2b..412baa72eebf45e0d726532d5e51a53a2a4d882b 100644
--- a/device/bluetooth/bluetooth_advertisement.h
+++ b/device/bluetooth/bluetooth_advertisement.h
@@ -37,6 +37,10 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdvertisement
                                          // is not registered.
     ERROR_ADVERTISEMENT_INVALID_LENGTH,  // Advertisement is not of a valid
                                          // length.
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
+    ERROR_INVALID_ADVERTISEMENT_INTERVAL,  // Advertisement interval specified
+                                           // is out of valid range.
+#endif
     INVALID_ADVERTISEMENT_ERROR_CODE
   };