Input type number should return SpinButtonRole from blink to chromium side to expose w correct role.

Source/core/accessibility/AXRenderObject.cpp

 /*
 * Copyright (C) 2008 Apple 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:
 *
 * 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 317 matching lines @@
         if (type == InputTypeNames::datetime
             || type == InputTypeNames::datetime_local
             || type == InputTypeNames::month
             || type == InputTypeNames::week)
             return DateTimeRole;
         if (type == InputTypeNames::radio) {
             if ((node->parentNode() && isHTMLMenuElement(node->parentNode())) || (parentObject() && parentObject()->roleValue() == MenuRole))
                 return MenuItemRadioRole;
             return RadioButtonRole;
         }
+        if (type == InputTypeNames::number)
+            return SpinButtonRole;
         if (input.isTextButton())
             return buttonRoleType();
         if (type == InputTypeNames::color)
             return ColorWellRole;
         if (type == InputTypeNames::time)
             return TimeRole;
     }
 
     if (isFileUploadButton())
         return ButtonRole;
@@ skipping 2087 matching lines @@
         if (label && label->renderer()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink