Improve Material ink effects

sky/shell/org/domokit/sky/shell/GestureProvider.java

Index: sky/shell/org/domokit/sky/shell/GestureProvider.java
diff --git a/sky/shell/org/domokit/sky/shell/GestureProvider.java b/sky/shell/org/domokit/sky/shell/GestureProvider.java
index 2018ff733d6f94f3e2a4293c6d86692b708484ef..f9e29e9ed94b19b8eb774e5f9b2d2559c03b1e06 100644
--- a/sky/shell/org/domokit/sky/shell/GestureProvider.java
+++ b/sky/shell/org/domokit/sky/shell/GestureProvider.java
@@ -38,9 +38,11 @@ public class GestureProvider implements GestureDetector.OnGestureListener {
     }
 
     private InputEvent createGestureEvent(MotionEvent event) {
+        int pointerIndex = event.getActionIndex();
         GestureData gestureData = new GestureData();
-        gestureData.x = event.getX();
-        gestureData.y = event.getY();
+        gestureData.primaryPointer = event.getPointerId(pointerIndex);
+        gestureData.x = event.getX(pointerIndex);
+        gestureData.y = event.getY(pointerIndex);
         InputEvent inputEvent = new InputEvent();
         inputEvent.timeStamp = event.getEventTime();
         inputEvent.gestureData = gestureData;