Update WebInputEventFactory on Mac for pinch gesture support

Source/web/WebInputEventFactoryMac.mm

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006-2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 348 matching lines @@
         code = [s length] > 0 ? windowsKeyCodeForCharCode([s characterAtIndex:0]) : 0;
         if (code)
             return code;
     }
 
     // Map Mac virtual key code directly to Windows one for any keys not handled above.
     // E.g. the key next to Caps Lock has the same Event.keyCode on U.S. keyboard ('A') and on Russian keyboard (CYRILLIC LETTER EF).
     return windowsKeyCodeForKeyCode([event keyCode]);
 }
 
-static WebInputEvent::Type gestureEventTypeForEvent(NSEvent *event)
-{
-    switch ([event type]) {
-    case NSEventTypeBeginGesture:
-        return WebInputEvent::GestureScrollBegin;
-    case NSEventTypeEndGesture:
-        return WebInputEvent::GestureScrollEnd;
-    default:
-        ASSERT_NOT_REACHED();
-        return WebInputEvent::GestureScrollEnd;
-    }
-}
-
 static inline NSString* textFromEvent(NSEvent* event)
 {
     if ([event type] == NSFlagsChanged)
         return @"";
     return [event characters];
 }
 
 static inline NSString* unmodifiedTextFromEvent(NSEvent* event)
 {
     if ([event type] == NSFlagsChanged)
@@ skipping 739 matching lines @@
 
     // Use a temporary WebMouseEvent to get the location.
     WebMouseEvent temp;
 
     setWebEventLocationFromEventInView(&temp, event, view);
     result.x = temp.x;
     result.y = temp.y;
     result.globalX = temp.globalX;
     result.globalY = temp.globalY;
 
-    result.type = gestureEventTypeForEvent(event);
     result.modifiers = modifiersFromEvent(event);
     result.timeStampSeconds = [event timestamp];
 
+    // MacOS X gestures are used only for pinch support.
+    result.sourceDevice = WebGestureEvent::Touchpad;
+    switch ([event type]) {
+    case NSEventTypeMagnify:
+        result.type = WebInputEvent::GesturePinchUpdate;
+        result.data.pinchUpdate.scale = [event magnification];
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+        result.type = WebInputEvent::Undefined;
+    }
+
     return result;
 }
 
 } // namespace blink