Adds special support to the device manager for keyboards devices.

ui/events/device_data_manager.cc

 // Copyright 2014 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.
 
 #include "ui/events/device_data_manager.h"
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "ui/events/input_device_event_observer.h"
@@ skipping 94 matching lines @@
 
 int64_t DeviceDataManager::GetDisplayForTouchDevice(int touch_device_id) const {
   if (IsTouchDeviceIdValid(touch_device_id))
     return touch_device_to_display_map_[touch_device_id];
   return gfx::Display::kInvalidDisplayID;
 }
 
 void DeviceDataManager::OnTouchscreenDevicesUpdated(
     const std::vector<TouchscreenDevice>& devices) {
   touchscreen_devices_ = devices;
+}
 
+void DeviceDataManager::OnKeyboardDevicesUpdated(
+    const std::vector<KeyboardDevice>& devices) {
+  keyboard_devices_ = devices;
+}

[sadrul, 2014/10/02 15:53:53]

You should explicitly call into OnInputDeviceConfigurationChanged() from here
and OnTouchscreenDevicesUpdated(), and not have that in the delegate interface.

[rsadam, 2014/10/02 22:52:27]

Changed to two methods as discussed offline.

+
+void DeviceDataManager::OnInputDeviceConfigurationChanged() {
   FOR_EACH_OBSERVER(InputDeviceEventObserver,
                     observers_,
                     OnInputDeviceConfigurationChanged());
 }
 
 void DeviceDataManager::AddObserver(InputDeviceEventObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void DeviceDataManager::RemoveObserver(InputDeviceEventObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 }  // namespace ui