Make Touch.radiusX/Y float and make Touch.webkit* aliases in the IDL

Source/web/WebInputEventConversion.cpp

Index: Source/web/WebInputEventConversion.cpp
diff --git a/Source/web/WebInputEventConversion.cpp b/Source/web/WebInputEventConversion.cpp
index 172b826a0677344096995a3df93018433914b0a3..12c590fbeea5952009cf5561f3526a10bc06d488 100644
--- a/Source/web/WebInputEventConversion.cpp
+++ b/Source/web/WebInputEventConversion.cpp
@@ -662,7 +662,7 @@ static WebTouchPoint toWebTouchPoint(const Touch* touch, const LayoutObject* lay
     point.position = convertAbsoluteLocationForLayoutObjectFloat(touch->absoluteLocation(), *layoutObject);
     point.radiusX = touch->radiusX();
     point.radiusY = touch->radiusY();
-    point.rotationAngle = touch->webkitRotationAngle();
+    point.rotationAngle = touch->rotationAngle();
     point.force = touch->force();
     point.state = state;
     return point;