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

public/platform/WebLayer.h

Index: public/platform/WebLayer.h
diff --git a/public/platform/WebLayer.h b/public/platform/WebLayer.h
index c21139208c67081f26e650d8614a0b85b2b135e6..d2cf86fb096201d2ecf1b716c9b54d3a7f317f8d 100644
--- a/public/platform/WebLayer.h
+++ b/public/platform/WebLayer.h
@@ -27,6 +27,7 @@
 #define WebLayer_h
 
 #include "WebAnimation.h"
+#include "WebBlendMode.h"
 #include "WebColor.h"
 #include "WebCommon.h"
 #include "WebCompositingReasons.h"
@@ -86,6 +87,18 @@ public:
     virtual void setOpacity(float) = 0;
     virtual float opacity() const = 0;
 
+    // The blending formula to be used for mixing colors of
+    // FIXME: Make pure virtual after implementation lands.
+    virtual void setBlendMode(WebBlendMode) { }
+    virtual WebBlendMode blendMode() const { return WebBlendModeNormal; }
+
+    // The layers within an isolated group should be composited over
+    // a transparent black initial backdrop. It will create a separate rendering
+    // surfece when required. http://dev.w3.org/fxtf/compositing-1/
+    // FIXME: Make pure virtual after implementation lands.
+    virtual void setIsIsolatedGroupRoot(bool) { }
+    virtual bool isIsolatedGroupRoot() { return false; }
+
     virtual void setOpaque(bool) = 0;
     virtual bool opaque() const = 0;