Add basic PointerEvent support in NewEventHandler

sky/engine/public/platform/WebInputEvent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 216 matching lines @@
 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;
+    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)) {}
 };
 
 // WebKeyboardEvent -----------------------------------------------------------
 
 class WebKeyboardEvent : public WebInputEvent {
 public:
     // Caps on string lengths so we can make them static arrays and keep
     // them PODs.
@@ skipping 285 matching lines @@
         , cancelable(true)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBINPUTEVENT_H_