Add Bluetooth device type icons on the device list in system tray.

ash/system/tray/system_tray_delegate.cc

Index: ash/system/tray/system_tray_delegate.cc
diff --git a/ash/system/tray/system_tray_delegate.cc b/ash/system/tray/system_tray_delegate.cc
index 92469dc0b28f7045cc09bf6b245dfc7f17238b2f..77a5a332cdf41c90c2ceff98bbcd6c35fbff4809 100644
--- a/ash/system/tray/system_tray_delegate.cc
+++ b/ash/system/tray/system_tray_delegate.cc
@@ -17,8 +17,13 @@ NetworkIconInfo::~NetworkIconInfo() {
 }
 
 BluetoothDeviceInfo::BluetoothDeviceInfo()
-    : connected(false), connecting(false), paired(false) {
-}
+    : device_type(ash::BluetoothDeviceInfo::DEVICE_UNKNOWN),
+      connected(false),
+      connecting(false),
+      paired(false) {}
+
+BluetoothDeviceInfo::BluetoothDeviceInfo(const BluetoothDeviceInfo& other) =
+    default;
 
 BluetoothDeviceInfo::~BluetoothDeviceInfo() {
 }