Add basic PointerEvent support in NewEventHandler

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 ea026b03df65e535d3431c0c27c7d04ee5ccaaf4..ed8138777056e152357f68981bf66c03962b9ac2 100644
--- a/sky/engine/public/platform/WebInputEvent.h
+++ b/sky/engine/public/platform/WebInputEvent.h
@@ -234,23 +234,23 @@ public:
 
     int pointer = 0;
     Kind kind = Touch;
-    double x = 0;
-    double y = 0;
-    double dx = 0;
-    double dy = 0;
+    float x = 0;
+    float y = 0;
+    float dx = 0;
+    float 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;
+    float pressure = 0;
+    float pressureMin = 0;
+    float pressureMax = 0;
+    float distance = 0;
+    float distanceMin = 0;
+    float distanceMax = 0;
+    float radiusMajor = 0;
+    float radiusMinor = 0;
+    float radiusMin = 0;
+    float radiusMax = 0;
+    float orientation = 0;
+    float tilt = 0;

[esprehn, 2015/01/20 18:14:33]

Why do we not want double precision?

[abarth-chromium, 2015/01/20 18:26:54]

My understanding is that |float| is more consistent with the actual precision of
the underlying sensors.  I can change them all to double if you'd prefer, but I
don't think the extra precision actually reflects anything in reality.

[esprehn, 2015/01/21 02:47:51]

Float seems fine then.

 
     WebPointerEvent() : WebInputEvent(sizeof(WebPointerEvent)) {}
 };