Mouse press should focus on any types of form controls.

Source/core/html/HTMLButtonElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 107 matching lines @@
             event->setDefaultHandled();
             m_isActivatedSubmit = false; // Do this in case submission was canceled.
         }
         if (form() && m_type == RESET) {
             form()->reset();
             event->setDefaultHandled();
         }
     }
 
     if (event->isKeyboardEvent()) {
-        if (event->type() == eventNames().keydownEvent && static_cast<KeyboardEvent*>(event)->keyIdentifier() == "U+0020") {
-            setActive(true, true);
-            // No setDefaultHandled() - IE dispatches a keypress in this case.
-            return;
+        if (event->type() == eventNames().keydownEvent) {
+            willHandleKeyDownEvent();
+            if (static_cast<KeyboardEvent*>(event)->keyIdentifier() == "U+0020") {
+                setActive(true, true);
+                // No setDefaultHandled() - IE dispatches a keypress in this case.
+                return;
+            }
         }
         if (event->type() == eventNames().keypressEvent) {
             switch (static_cast<KeyboardEvent*>(event)->charCode()) {
                 case '\r':
                     dispatchSimulatedClick(event);
                     event->setDefaultHandled();
                     return;
                 case ' ':
                     // Prevent scrolling down the page.
                     event->setDefaultHandled();
@@ skipping 59 matching lines @@
 {
     return getAttribute(valueAttr);
 }
 
 bool HTMLButtonElement::recalcWillValidate() const
 {
     return m_type == SUBMIT && HTMLFormControlElement::recalcWillValidate();
 }
 
 } // namespace