Sets a transparent background for out-of-process subframes.

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 97 matching lines @@
     WebColor backgroundColor() const override;
     bool selectionBounds(WebRect& anchor, WebRect& focus) const override;
     bool selectionTextDirection(WebTextDirection& start, WebTextDirection& end) const override;
     bool isSelectionAnchorFirst() const override;
     bool caretOrSelectionRange(size_t* location, size_t* length) override;
     void setTextDirection(WebTextDirection) override;
     bool isAcceleratedCompositingActive() const override;
     void willCloseLayerTreeView() override;
     void didChangeWindowResizerRect() override;
 
+    // WebFrameWidget implementation.
+    void setVisibilityState(WebPageVisibilityState, bool) override;
+    bool isTransparent() const override;
+    void setIsTransparent(bool) override;
+    void setBaseBackgroundColor(WebColor) override;
+    void scheduleAnimation() override;
+
     WebWidgetClient* client() const { return m_client; }
 
     Frame* focusedCoreFrame() const;
 
     // Returns the currently focused Element or null if no element has focus.
     Element* focusedElement() const;
 
-    void scheduleAnimation() override;
-
     PaintLayerCompositor* compositor() const;
     void setRootGraphicsLayer(GraphicsLayer*);
     void attachCompositorAnimationTimeline(CompositorAnimationTimeline*);
     void detachCompositorAnimationTimeline(CompositorAnimationTimeline*);
 
-    void setVisibilityState(WebPageVisibilityState, bool) override;
-
     // Exposed for the purpose of overriding device metrics.
     void sendResizeEventAndRepaint();
 
     void updateMainFrameLayoutSize();
 
     void setIgnoreInputEvents(bool newValue);
 
     // Returns the page object associated with this widget. This may be null when
     // the page is shutting down, but will be valid at all other times.
     Page* page() const { return view()->page(); }
 
     // Event related methods:
     void mouseContextMenu(const WebMouseEvent&);
 
     WebLayerTreeView* layerTreeView() const { return m_layerTreeView; }
 
     // Returns true if the event leads to scrolling.
     static bool mapKeyCodeForScroll(
         int keyCode,
         ScrollDirection*,
         ScrollGranularity*);
 
+    Color baseBackgroundColor() const { return m_baseBackgroundColor; }
+
     DECLARE_TRACE();
 
 private:
     friend class WebFrameWidget; // For WebFrameWidget::create.
 #if ENABLE(OILPAN)
     friend class GarbageCollectedFinalized<WebFrameWidgetImpl>;
 #else
     friend class WTF::RefCounted<WebFrameWidgetImpl>;
 #endif
 
     explicit WebFrameWidgetImpl(WebWidgetClient*, WebLocalFrame*);
     ~WebFrameWidgetImpl();
 
     // Perform a hit test for a point relative to the root frame of the page.
     HitTestResult hitTestResultForRootFramePos(const IntPoint& posInRootFrame);
 
     // Returns true if the event was actually processed.
     WebInputEventResult keyEventDefault(const WebKeyboardEvent&);
 
     // Returns true if the view was scrolled.
     WebInputEventResult scrollViewWithKeyboard(int keyCode, int modifiers);
 
     void initializeLayerTreeView();
 
     void setIsAcceleratedCompositingActive(bool);
     void updateLayerTreeViewport();
     void updateLayerTreeBackgroundColor();
     void updateLayerTreeDeviceScaleFactor();
 
-    bool isTransparent() const;
-
     // 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;
 
     WebViewImpl* view() const { return m_localRoot->viewImpl(); }
@@ skipping 13 matching lines @@
     WebLayerTreeView* m_layerTreeView;
     WebLayer* m_rootLayer;
     GraphicsLayer* m_rootGraphicsLayer;
     bool m_isAcceleratedCompositingActive;
     bool m_layerTreeViewClosed;
 
     bool m_suppressNextKeypressEvent;
 
     bool m_ignoreInputEvents;
 
+    // Whether the WebFrameWidget is rendering transparently.
+    bool m_isTransparent;
+
     static const WebInputEvent* m_currentInputEvent;
 
+    WebColor m_baseBackgroundColor;
+
 #if ENABLE(OILPAN)
     SelfKeepAlive<WebFrameWidgetImpl> m_selfKeepAlive;
 #endif
 };
 
 DEFINE_TYPE_CASTS(WebFrameWidgetImpl, WebFrameWidget, widget, widget->forSubframe(), widget.forSubframe());
 
 } // namespace blink
 
 #endif