Add maxTouchPoints for pointer events

Source/core/page/Settings.in

Index: Source/core/page/Settings.in
diff --git a/Source/core/page/Settings.in b/Source/core/page/Settings.in
index df7ace416f5635211e783b31a6e34e05b3163ac0..01357f74dcba21474ba0f67137f3f66e7fd50af1 100644
--- a/Source/core/page/Settings.in
+++ b/Source/core/page/Settings.in
@@ -155,6 +155,12 @@ shouldRespectImageOrientation initial=false
 deviceSupportsTouch initial=false
 deviceSupportsMouse initial=true
 
+# This value indicates the number of simultaneous multi-touch points supported
+# by the currently connected screen/digitizer that supports the most points.
+# From Pointer Events spec:
+#   http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints
+maxTouchPoints type=int, initial=0
+
 # Whether touch gestures should be "fuzzed" to nearest touch targets.
 # It's expected that this is enabled everywhere by default, but it may be
 # disabled for testing purposes as the algorithm is not yet perfect.