DNS: Testing for [blink] Support (semi-)transparent background colors.

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

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 172 matching lines @@
 
   bool isEnclosedInCompositingLayer() const;
 
   void dispose() override;
   void detachScrollbars();
   void recalculateCustomScrollbarStyle();
   void invalidateAllCustomScrollbarsOnActiveChanged();
 
   void clear();
 
-  bool isTransparent() const;
-  void setTransparent(bool isTransparent);
-
-  // True if the FrameView is not transparent, and the base background color is
-  // opaque.
+  // True if the FrameView's base background color is completely opaque.
   bool hasOpaqueBackground() const;
 
   Color baseBackgroundColor() const;
   void setBaseBackgroundColor(const Color&);
-  void updateBackgroundRecursively(const Color&, bool);
+  void updateBaseBackgroundColorRecursively(const Color&);
 
   void adjustViewSize();
   void adjustViewSizeAndLayout();
 
   // Scale used to convert incoming input events.
   float inputEventsScaleFactor() const;
 
   // Offset used to convert incoming input events while emulating device metics.
   IntSize inputEventsOffsetForEmulation() const;
   void setInputEventsTransformForEmulation(const IntSize&, float);
@@ skipping 864 matching lines @@
   DepthOrderedLayoutObjectList m_orthogonalWritingModeRootList;
 
   bool m_layoutSchedulingEnabled;
   bool m_inSynchronousPostLayout;
   int m_layoutCount;
   unsigned m_nestedLayoutCount;
   TaskRunnerTimer<FrameView> m_postLayoutTasksTimer;
   TaskRunnerTimer<FrameView> m_updatePluginsTimer;
 
   bool m_firstLayout;
-  bool m_isTransparent;
   Color m_baseBackgroundColor;
   IntSize m_lastViewportSize;
   float m_lastZoomFactor;
 
   AtomicString m_mediaType;
   AtomicString m_mediaTypeWhenNotPrinting;
 
   bool m_safeToPropagateScrollToParent;
 
   unsigned m_visuallyNonEmptyCharacterCount;
@@ skipping 168 matching lines @@
                   frameViewBase.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h