Simplify and add caching for accessible bounding box calculation.

Source/WebKit/chromium/src/WebAccessibilityObject.cpp

 /*
  * 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 473 matching lines @@
         return WebString();
 
     return m_private->ariaLiveRegionStatus();
 }
 
 WebRect WebAccessibilityObject::boundingBoxRect() const
 {
     if (isDetached())
         return WebRect();
 
-    return m_private->pixelSnappedBoundingBoxRect();
+    return pixelSnappedIntRect(m_private->elementRect());
 }
 
 bool WebAccessibilityObject::canvasHasFallbackContent() const
 {
     if (isDetached())
         return false;
 
     return m_private->canvasHasFallbackContent();
 }
 
@@ skipping 49 matching lines @@
 {
     if (isDetached())
         return WebAccessibilityObject();
 
     IntPoint contentsPoint = m_private->documentFrameView()->windowToContents(point);
     RefPtr<AccessibilityObject> hit = m_private->accessibilityHitTest(contentsPoint);
 
     if (hit)
         return WebAccessibilityObject(hit);
 
-    if (m_private->boundingBoxRect().contains(contentsPoint))
+    if (m_private->elementRect().contains(contentsPoint))
         return *this;
 
     return WebAccessibilityObject();
 }
 
 WebString WebAccessibilityObject::keyboardShortcut() const
 {
     if (isDetached())
         return WebString();
 
@@ skipping 483 matching lines @@
     m_private = object;
     return *this;
 }
 
 WebAccessibilityObject::operator WTF::PassRefPtr<WebCore::AccessibilityObject>() const
 {
     return m_private.get();
 }
 
 } // namespace WebKit