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 03ae0be6ea80d3cf540046e9f4dedf9cddcd316f..4affa6d25b0b72db63492f050a4006721cab31f9 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;