AXObject::performDefaultAction() should focus if it can't click

third_party/WebKit/Source/modules/accessibility/AXSpinButton.cpp

 /*
  * Copyright (C) 2011 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 110 matching lines @@
   if (m_isIncrementor) {
     outBoundsInContainer.setHeight(outBoundsInContainer.height() / 2);
   } else {
     outBoundsInContainer.setY(outBoundsInContainer.y() +
                               outBoundsInContainer.height() / 2);
     outBoundsInContainer.setHeight(outBoundsInContainer.height() / 2);
   }
   *outContainer = parentObject();
 }
 
-bool AXSpinButtonPart::press() const {
+bool AXSpinButtonPart::press() {
   if (!m_parent || !m_parent->isSpinButton())
     return false;
 
   AXSpinButton* spinButton = toAXSpinButton(parentObject());
   if (m_isIncrementor)
     spinButton->step(1);
   else
     spinButton->step(-1);
 
   return true;
 }
 
 }  // namespace blink