Switch Sky to pointer events

sky/engine/public/platform/WebInputEvent.h

Index: sky/engine/public/platform/WebInputEvent.h
diff --git a/sky/engine/public/platform/WebInputEvent.h b/sky/engine/public/platform/WebInputEvent.h
index ed8138777056e152357f68981bf66c03962b9ac2..a3f5161956ef0d37cb12775b57068ae532cfb61e 100644
--- a/sky/engine/public/platform/WebInputEvent.h
+++ b/sky/engine/public/platform/WebInputEvent.h
@@ -187,6 +187,14 @@ public:
     Type type;
     int modifiers;
 
+    static bool isPointerEventType(int type)
+    {
+        return type == PointerDown ||

[ojan, 2015/01/23 10:23:55]

Probably premature optimization, but we could save two branches here by doing
range checks type >= PointerDown || type <= PointerCancel.

[abarth-chromium, 2015/01/23 16:51:33]

Ok.  That's what the other similar functions do.

+               type == PointerMove ||
+               type == PointerUp ||
+               type == PointerCancel;
+    }
+
     // Returns true if the WebInputEvent |type| is a mouse event.
     static bool isMouseEventType(int type)
     {