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 87e3bd46a1e320c5dd5dfbb326bff0a47e3d27ea..f19daed8218a566e60bc9a8d703d9e8d24e40bef 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"
 
@@ -24,6 +25,7 @@ class InputDeviceEventObserver;
 // Keeps track of device mappings and event transformations.
 class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
  public:
+  static const int kMaxDeviceNum = 128;
   ~DeviceDataManager() override;
 
   static void CreateInstance();
@@ -32,18 +34,22 @@ class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
 
   void ClearTouchTransformerRecord();
   void UpdateTouchInfoForDisplay(int64_t display_id,
-                                 int touch_device_id,
+                                 unsigned int touch_device_id,
                                  const gfx::Transform& touch_transformer);
-  void ApplyTouchTransformer(int touch_device_id, float* x, float* y);
-  int64_t GetDisplayForTouchDevice(int touch_device_id) const;
+  void ApplyTouchTransformer(unsigned int touch_device_id, float* x, float* y);
+  int64_t GetDisplayForTouchDevice(unsigned int touch_device_id) const;
 
-  void UpdateTouchRadiusScale(int touch_device_id, double scale);
-  void ApplyTouchRadiusScale(int touch_device_id, double* radius);
+  void UpdateTouchRadiusScale(unsigned int touch_device_id, double scale);
+  void ApplyTouchRadiusScale(unsigned int touch_device_id, double* radius);
 
   const std::vector<TouchscreenDevice>& touchscreen_devices() const {
     return touchscreen_devices_;
   }
 
+  const std::vector<KeyboardDevice>& keyboard_devices() const {
+    return keyboard_devices_;
+  }
+
   void AddObserver(InputDeviceEventObserver* observer);
   void RemoveObserver(InputDeviceEventObserver* observer);
 
@@ -52,16 +58,16 @@ class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
 
   static DeviceDataManager* instance();
 
-  static const int kMaxDeviceNum = 128;
+  // DeviceHotplugEventObserver:
+  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:
-  void OnTouchscreenDevicesUpdated(
-      const std::vector<TouchscreenDevice>& devices) override;
+  bool IsTouchDeviceIdValid(unsigned int touch_device_id) const;
 
   double touch_radius_scale_map_[kMaxDeviceNum];
 
@@ -71,6 +77,7 @@ 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_;