Adds special support to the device manager for keyboards devices.

ui/events/device_data_manager.cc

Index: ui/events/device_data_manager.cc
diff --git a/ui/events/device_data_manager.cc b/ui/events/device_data_manager.cc
index d255b871abc80b10082d7408e92e25deafc7cb9a..fd9976461a658ffe6227b62d3d8d32bcb7daa26e 100644
--- a/ui/events/device_data_manager.cc
+++ b/ui/events/device_data_manager.cc
@@ -112,7 +112,14 @@ int64_t DeviceDataManager::GetDisplayForTouchDevice(int touch_device_id) const {
 void DeviceDataManager::OnTouchscreenDevicesUpdated(
     const std::vector<TouchscreenDevice>& devices) {
   touchscreen_devices_ = devices;
+}
+
+void DeviceDataManager::OnKeyboardDevicesUpdated(
+    const std::vector<KeyboardDevice>& devices) {
+  keyboard_devices_ = devices;
+}
 
+void DeviceDataManager::OnInputDeviceConfigurationChanged() {
   FOR_EACH_OBSERVER(InputDeviceEventObserver,
                     observers_,
                     OnInputDeviceConfigurationChanged());