Update background color when it is transparent.

Source/core/frame/LocalFrame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 366 matching lines @@
 
         // The layout size is set by WebViewImpl to support @viewport
         frameView->setLayoutSizeFixedToFrameSize(false);
     } else
         frameView = FrameView::create(this);
 
     frameView->setScrollbarModes(horizontalScrollbarMode, verticalScrollbarMode, horizontalLock, verticalLock);
 
     setView(frameView);
 
-    if (backgroundColor.alpha())
-        frameView->updateBackgroundRecursively(backgroundColor, transparent);
+    frameView->updateBackgroundRecursively(backgroundColor, transparent);
 
     if (isMainFrame)
         frameView->setParentVisible(true);
 
     // FIXME: Not clear what the right thing for OOPI is here.
     if (ownerRenderer()) {
         HTMLFrameOwnerElement* owner = deprecatedLocalOwner();
         ASSERT(owner);
         owner->setWidget(frameView);
     }
@@ skipping 259 matching lines @@
 LocalFrame* LocalFrame::localFrameRoot()
 {
     LocalFrame* curFrame = this;
     while (curFrame && curFrame->tree().parent() && curFrame->tree().parent()->isLocalFrame())
         curFrame = curFrame->tree().parent();
 
     return curFrame;
 }
 
 } // namespace WebCore