Slimming Paint phase 2 compositing algorithm plumbing & skeleton display list API.

Source/core/dom/DocumentLifecycle.cpp

Index: Source/core/dom/DocumentLifecycle.cpp
diff --git a/Source/core/dom/DocumentLifecycle.cpp b/Source/core/dom/DocumentLifecycle.cpp
index 25abf3c9c49481710b9a62c380547cdd91aec1c1..d211b751ae752ae965da5e7266dec7531bdb6022 100644
--- a/Source/core/dom/DocumentLifecycle.cpp
+++ b/Source/core/dom/DocumentLifecycle.cpp
@@ -30,6 +30,7 @@
 
 #include "config.h"
 #include "core/dom/DocumentLifecycle.h"
+#include "platform/RuntimeEnabledFeatures.h"
 
 #include "wtf/Assertions.h"
 
@@ -172,6 +173,8 @@ bool DocumentLifecycle::canAdvanceTo(State state) const
             return true;
         if (state == InCompositingUpdate)
             return true;
+        if (RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled() && state == InPaintInvalidation)
+            return true;
         break;
     case InCompositingUpdate:
         return state == CompositingClean;