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 900a85fe63c82d6a8d2859bfe708e9822b32d1fe..8c120e465628e0ba2383036a4443ce1f700e22e0 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 +87,14 @@ public:
     virtual void setOpacity(float) = 0;
     virtual float opacity() const = 0;
 
+    // FIXME: Make pure virtual after implementation lands.
+    virtual void setBlendMode(WebBlendMode) { }
+    virtual WebBlendMode blendMode() const { return WebBlendModeNormal; }
+
+    // FIXME: Make pure virtual after implementation lands.
+    virtual void setIsRootForIsolatedGroup(bool) { }
+    virtual bool isRootForIsolatedGroup() { return false; }
+
     virtual void setOpaque(bool) = 0;
     virtual bool opaque() const = 0;