mix-blend-mode implementation for accelerated layers - blink part

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index f266b81261bec4b01c3d5c91bfa5b610af94f8d3..a53fec89f5753f3f66642ec8c8a9e0376f72c900 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -357,6 +357,7 @@ public:
     bool needsCompositingLayersRebuiltForClip(const RenderStyle* oldStyle, const RenderStyle* newStyle) const;
     bool needsCompositingLayersRebuiltForOverflow(const RenderStyle* oldStyle, const RenderStyle* newStyle) const;
     bool needsCompositingLayersRebuiltForFilters(const RenderStyle* oldStyle, const RenderStyle* newStyle, bool didPaintWithFilters) const;
+    bool needsCompositingLayersRebuiltForBlending(const RenderStyle* oldStyle, const RenderStyle* newStyle) const;
 
     bool paintsWithTransparency(PaintBehavior paintBehavior) const
     {
@@ -589,6 +590,9 @@ private:
     bool hasCompositingDescendant() const { return m_compositingProperties.hasCompositingDescendant; }
     void setHasCompositingDescendant(bool b)  { m_compositingProperties.hasCompositingDescendant = b; }
 
+    bool shouldIsolateCompositedDescendants() const { return m_compositingProperties.shouldIsolateCompositedDescendants; }
+    void setShouldIsolateCompositedDescendants(bool b)  { m_compositingProperties.shouldIsolateCompositedDescendants = b; }
+
     void setCompositingReasons(CompositingReasons reasons) { m_compositingProperties.compositingReasons = reasons; }
     CompositingReasons compositingReasons() const { return m_compositingProperties.compositingReasons; }
 
@@ -678,6 +682,7 @@ protected:
     struct CompositingProperties {
         CompositingProperties()
             : hasCompositingDescendant(false)
+            , shouldIsolateCompositedDescendants(false)
             , viewportConstrainedNotCompositedReason(NoNotCompositedReason)
             , compositingReasons(CompositingReasonNone)
         { }
@@ -685,6 +690,9 @@ protected:
         // Used only while determining what layers should be composited. Applies to the tree of z-order lists.
         bool hasCompositingDescendant : 1;
 
+        // Should be for stacking contexts having unisolated blending descendants.
+        bool shouldIsolateCompositedDescendants : 1;
+
         // The reason, if any exists, that a fixed-position layer is chosen not to be composited.
         unsigned viewportConstrainedNotCompositedReason : 2;