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

public/platform/WebCompositingReasons.h

Index: public/platform/WebCompositingReasons.h
diff --git a/public/platform/WebCompositingReasons.h b/public/platform/WebCompositingReasons.h
index 9b7b8a272e028c18bead3fb2c08bcfccdcc17465..f3c8688d05f38a52f20c2a23ec5bd6f093cf3dc6 100644
--- a/public/platform/WebCompositingReasons.h
+++ b/public/platform/WebCompositingReasons.h
@@ -71,6 +71,7 @@ const uint64_t CompositingReasonLayerForBackground                     = static_
 const uint64_t CompositingReasonLayerForMask                           = static_cast<uint64_t>(1) << 31;
 const uint64_t CompositingReasonOverflowScrollingParent                = static_cast<uint64_t>(1) << 32;
 const uint64_t CompositingReasonOutOfFlowClipping                      = static_cast<uint64_t>(1) << 33;
+const uint64_t CompositingReasonIsolateCompositedDescendants           = static_cast<uint64_t>(1) << 35;
 
 typedef uint64_t WebCompositingReasons;