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

third_party/WebKit/Source/web/WebFrameWidgetImpl.h

 /*
  * Copyright (C) 2014 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 96 matching lines @@
   WebRange caretOrSelectionRange() override;
   void setTextDirection(WebTextDirection) override;
   bool isAcceleratedCompositingActive() const override;
   void willCloseLayerTreeView() override;
   bool getCompositionCharacterBounds(WebVector<WebRect>& bounds) override;
   void setRemoteViewportIntersection(const WebRect&) override;
 
   // WebFrameWidget implementation.
   WebLocalFrameImpl* localRoot() const override { return m_localRoot; }
   void setVisibilityState(WebPageVisibilityState) override;
-  bool isTransparent() const override;
-  void setIsTransparent(bool) override;
+  void setBackgroundColorOverride(WebColor) override;
+  void clearBackgroundColorOverride() override;
+  void setBaseBackgroundColorOverride(WebColor) override;
+  void clearBaseBackgroundColorOverride() override;
   void setBaseBackgroundColor(WebColor) override;
   WebInputMethodControllerImpl* getActiveWebInputMethodController()
       const override;
 
   Frame* focusedCoreFrame() const;
 
   // Returns the currently focused Element or null if no element has focus.
   Element* focusedElement() const;
 
   PaintLayerCompositor* compositor() const;
@@ skipping 15 matching lines @@
   void sendResizeEventAndRepaint();
 
   void updateMainFrameLayoutSize();
 
   // Event related methods:
   void mouseContextMenu(const WebMouseEvent&);
 
   WebLayerTreeView* layerTreeView() const { return m_layerTreeView; }
   GraphicsLayer* rootGraphicsLayer() const { return m_rootGraphicsLayer; };
 
-  Color baseBackgroundColor() const { return m_baseBackgroundColor; }
+  Color baseBackgroundColor() const;
 
   DECLARE_TRACE();
 
  private:
   friend class WebFrameWidget;  // For WebFrameWidget::create.
 
   explicit WebFrameWidgetImpl(WebWidgetClient*, WebLocalFrame*);
 
   // Perform a hit test for a point relative to the root frame of the page.
   HitTestResult hitTestResultForRootFramePos(const IntPoint& posInRootFrame);
 
   void initializeLayerTreeView();
 
   void setIsAcceleratedCompositingActive(bool);
   void updateLayerTreeViewport();
   void updateLayerTreeBackgroundColor();
   void updateLayerTreeDeviceScaleFactor();
+  void updateBaseBackgroundColor();
 
   // PageWidgetEventHandler functions
   void handleMouseLeave(LocalFrame&, const WebMouseEvent&) override;
   void handleMouseDown(LocalFrame&, const WebMouseEvent&) override;
   void handleMouseUp(LocalFrame&, const WebMouseEvent&) override;
   WebInputEventResult handleMouseWheel(LocalFrame&,
                                        const WebMouseWheelEvent&) override;
   WebInputEventResult handleGestureEvent(const WebGestureEvent&) override;
   WebInputEventResult handleKeyEvent(const WebKeyboardEvent&) override;
   WebInputEventResult handleCharEvent(const WebKeyboardEvent&) override;
@@ skipping 32 matching lines @@
 
   WebLayerTreeView* m_layerTreeView;
   WebLayer* m_rootLayer;
   GraphicsLayer* m_rootGraphicsLayer;
   std::unique_ptr<CompositorAnimationHost> m_animationHost;
   bool m_isAcceleratedCompositingActive;
   bool m_layerTreeViewClosed;
 
   bool m_suppressNextKeypressEvent;
 
-  // Whether the WebFrameWidget is rendering transparently.
-  bool m_isTransparent;
+  bool m_backgroundColorOverrideEnabled;
+  WebColor m_backgroundColorOverride;
+  bool m_baseBackgroundColorOverrideEnabled;
+  WebColor m_baseBackgroundColorOverride;
 
   // TODO(ekaramad): Can we remove this and make sure IME events are not called
   // when there is no page focus?
   // Represents whether or not this object should process incoming IME events.
   bool m_imeAcceptEvents;
 
   static const WebInputEvent* m_currentInputEvent;
 
   WebColor m_baseBackgroundColor;
 
   SelfKeepAlive<WebFrameWidgetImpl> m_selfKeepAlive;
 };
 
 DEFINE_TYPE_CASTS(WebFrameWidgetImpl,
                   WebFrameWidgetBase,
                   widget,
                   widget->forSubframe(),
                   widget.forSubframe());
 
 }  // namespace blink
 
 #endif