[blink] Support (semi-)transparent background colors in WebView/Frame.

third_party/WebKit/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>
@@ skipping 252 matching lines @@
   ASSERT(!m_view || m_view != view);
   ASSERT(!document() || !document()->isActive());
 
   eventHandler().clear();
 
   m_view = view;
 }
 
 void LocalFrame::createView(const IntSize& viewportSize,
                             const Color& backgroundColor,
-                            bool transparent,
                             ScrollbarMode horizontalScrollbarMode,
                             bool horizontalLock,
                             ScrollbarMode verticalScrollbarMode,
                             bool verticalLock) {
   ASSERT(this);
   ASSERT(page());
 
   bool isLocalRoot = this->isLocalRoot();
 
   if (isLocalRoot && view())
     view()->setParentVisible(false);
 
   setView(nullptr);
 
   FrameView* frameView = nullptr;
   if (isLocalRoot) {
     frameView = FrameView::create(*this, viewportSize);
 
     // 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);
 
-  frameView->updateBackgroundRecursively(backgroundColor, transparent);
+  frameView->updateBaseBackgroundColorRecursively(backgroundColor);
 
   if (isLocalRoot)
     frameView->setParentVisible(true);
 
   // FIXME: Not clear what the right thing for OOPI is here.
   if (!ownerLayoutItem().isNull()) {
     HTMLFrameOwnerElement* owner = deprecatedLocalOwner();
     ASSERT(owner);
     // FIXME: OOPI might lead to us temporarily lying to a frame and telling it
     // that it's owned by a FrameOwner that knows nothing about it. If we're
@@ skipping 587 matching lines @@
   if (m_frame && m_frame->client() && m_frame->client()->frameBlameContext())
     m_frame->client()->frameBlameContext()->Enter();
 }
 
 ScopedFrameBlamer::~ScopedFrameBlamer() {
   if (m_frame && m_frame->client() && m_frame->client()->frameBlameContext())
     m_frame->client()->frameBlameContext()->Leave();
 }
 
 }  // namespace blink