Adds special support to the device manager for keyboards devices.

ui/events/device_data_manager.h

Index: ui/events/device_data_manager.h
diff --git a/ui/events/device_data_manager.h b/ui/events/device_data_manager.h
index aae827204cc5e7e11aae927a68e244c587cb5469..132b9a90c9f81a9315f148d6eebb4cb3cbc104c3 100644
--- a/ui/events/device_data_manager.h
+++ b/ui/events/device_data_manager.h
@@ -14,6 +14,7 @@
 #include "base/observer_list.h"
 #include "ui/events/device_hotplug_event_observer.h"
 #include "ui/events/events_base_export.h"
+#include "ui/events/keyboard_device.h"
 #include "ui/events/touchscreen_device.h"
 #include "ui/gfx/transform.h"
 
@@ -44,6 +45,10 @@ class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
     return touchscreen_devices_;
   }
 
+  const std::vector<KeyboardDevice>& keyboard_devices() const {
+    return keyboard_devices_;
+  }
+
   void AddObserver(InputDeviceEventObserver* observer);
   void RemoveObserver(InputDeviceEventObserver* observer);
 
@@ -54,15 +59,17 @@ class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
 
   static const int kMaxDeviceNum = 128;
 
+  // DeviceHotplugEventObserver:
+  virtual void OnTouchscreenDevicesUpdated(
+      const std::vector<TouchscreenDevice>& devices) override;
+  virtual void OnKeyboardDevicesUpdated(
+      const std::vector<KeyboardDevice>& devices) override;
+
  private:
   static DeviceDataManager* instance_;
 
   bool IsTouchDeviceIdValid(int touch_device_id) const;
 
-  // DeviceHotplugEventObserver:
-  virtual void OnTouchscreenDevicesUpdated(
-      const std::vector<TouchscreenDevice>& devices) OVERRIDE;
-
   double touch_radius_scale_map_[kMaxDeviceNum];
 
   // Table to keep track of which display id is mapped to which touch device.
@@ -71,6 +78,7 @@ class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
   gfx::Transform touch_device_transformer_map_[kMaxDeviceNum];
 
   std::vector<TouchscreenDevice> touchscreen_devices_;
+  std::vector<KeyboardDevice> keyboard_devices_;
 
   ObserverList<InputDeviceEventObserver> observers_;