Scale touch event radius

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 7b2feaaa57a6c971eed5154528df7a094e12f310..838ce67210f1dc669e9cbc079d46967e4be34293 100644
--- a/ui/events/device_data_manager.h
+++ b/ui/events/device_data_manager.h
@@ -30,6 +30,9 @@ class EVENTS_BASE_EXPORT DeviceDataManager {
   void ApplyTouchTransformer(int touch_device_id, float* x, float* y);
   int64_t GetDisplayForTouchDevice(int touch_device_id) const;
 
+  void UpdateTouchRadiusScale(int touch_device_id, double scale);
+  void ApplyTouchRadiusScale(int touch_device_id, double* radius);
+
  protected:
   DeviceDataManager();
 
@@ -42,6 +45,8 @@ class EVENTS_BASE_EXPORT DeviceDataManager {
 
   bool IsTouchDeviceIdValid(int touch_device_id) const;
 
+  double touch_radius_scale_map_[kMaxDeviceNum];
+
   // Table to keep track of which display id is mapped to which touch device.
   int64_t touch_device_to_display_map_[kMaxDeviceNum];
   // Index table to find the TouchTransformer for a touch device.