Add blink::WebPointerEvent

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 58d15cd2679fd46732c930e09b3cce10567cc760..ea026b03df65e535d3431c0c27c7d04ee5ccaaf4 100644
--- a/sky/engine/public/platform/WebInputEvent.h
+++ b/sky/engine/public/platform/WebInputEvent.h
@@ -86,6 +86,12 @@ public:
         Undefined = -1,
         TypeFirst = Undefined,
 
+        // WebPointerEvent
+        PointerDown,
+        PointerUp,
+        PointerMove,
+        PointerCancel,
+
         // WebMouseEvent
         MouseDown,
         MouseTypeFirst = MouseDown,
@@ -216,6 +222,39 @@ protected:
     }
 };
 
+// WebPointerEvent ------------------------------------------------------------
+
+class WebPointerEvent : public WebInputEvent {
+public:
+    enum Kind {
+        Touch,
+        Mouse,
+        Stylus,
+    };
+
+    int pointer = 0;
+    Kind kind = Touch;
+    double x = 0;
+    double y = 0;
+    double dx = 0;
+    double dy = 0;
+    int buttons = 0;
+    double pressure = 0;
+    double pressureMin = 0;
+    double pressureMax = 0;
+    double distance = 0;
+    double distanceMin = 0;
+    double distanceMax = 0;
+    double radiusMajor = 0;
+    double radiusMinor = 0;
+    double radiusMin = 0;
+    double radiusMax = 0;
+    double orientation = 0;
+    double tilt = 0;
+
+    WebPointerEvent() : WebInputEvent(sizeof(WebPointerEvent)) {}
+};
+
 // WebKeyboardEvent -----------------------------------------------------------
 
 class WebKeyboardEvent : public WebInputEvent {