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

third_party/WebKit/Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 81 matching lines @@
   static LocalFrame* create(LocalFrameClient*,
                             Page*,
                             FrameOwner*,
                             InterfaceProvider* = nullptr,
                             InterfaceRegistry* = nullptr);
 
   void init();
   void setView(FrameView*);
   void createView(const IntSize&,
                   const Color&,
-                  bool,
                   ScrollbarMode = ScrollbarAuto,
                   bool horizontalLock = false,
                   ScrollbarMode = ScrollbarAuto,
                   bool verticalLock = false);
 
   // Frame overrides:
   ~LocalFrame() override;
   DECLARE_VIRTUAL_TRACE();
   void navigate(Document& originDocument,
                 const KURL&,
@@ skipping 260 matching lines @@
   explicit ScopedFrameBlamer(LocalFrame*);
   ~ScopedFrameBlamer();
 
  private:
   Member<LocalFrame> m_frame;
 };
 
 }  // namespace blink
 
 #endif  // LocalFrame_h