Expose fractional TouchEvent coordinates

Source/core/dom/Touch.idl

Index: Source/core/dom/Touch.idl
diff --git a/Source/core/dom/Touch.idl b/Source/core/dom/Touch.idl
index 7ff3d973b244f908360799162d41a9ef503acf84..574d68441d0d5d0e8bad8011acfbe964eca49529 100644
--- a/Source/core/dom/Touch.idl
+++ b/Source/core/dom/Touch.idl
@@ -26,16 +26,16 @@
 [
     WillBeGarbageCollected,
 ] interface Touch {
-    readonly attribute long             clientX;
-    readonly attribute long             clientY;
-    readonly attribute long             screenX;
-    readonly attribute long             screenY;
-    readonly attribute long             pageX;
-    readonly attribute long             pageY;
+    readonly attribute double           clientX;
+    readonly attribute double           clientY;
+    readonly attribute double           screenX;
+    readonly attribute double           screenY;
+    readonly attribute double           pageX;
+    readonly attribute double           pageY;
     readonly attribute EventTarget      target;
     readonly attribute unsigned long    identifier;
-    [MeasureAs=PrefixedTouchRadiusX] readonly attribute long webkitRadiusX;
-    [MeasureAs=PrefixedTouchRadiusY] readonly attribute long webkitRadiusY;
+    [MeasureAs=PrefixedTouchRadiusX] readonly attribute double webkitRadiusX;
+    [MeasureAs=PrefixedTouchRadiusY] readonly attribute double webkitRadiusY;
     [MeasureAs=PrefixedTouchRotationAngle] readonly attribute float webkitRotationAngle;
     [MeasureAs=PrefixedTouchForce] readonly attribute float webkitForce;
 };