Add a document phase for calculating paint properties

third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp

Index: third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp b/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
index 643e88ef3446c562d8b6cdb760bd3a783a5e668a..a7913447072c7942e7d02392d76f4a0c5f4fec75 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
@@ -195,7 +195,20 @@ bool DocumentLifecycle::canAdvanceTo(State nextState) const
             return true;
         if (nextState == InCompositingUpdate)
             return true;
-        if (nextState == InPaint && RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled())
+        if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+            if (nextState == InCalcPaintProps)
+                return true;
+        } else {
+            if (nextState == InPaint && RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled())
+                return true;
+        }
+        break;
+    case InCalcPaintProps:
+        if (nextState == CalcPaintPropsClean && RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+            return true;
+        break;
+    case CalcPaintPropsClean:
+        if (nextState == InPaint && RuntimeEnabledFeatures::slimmingPaintV2Enabled())
             return true;
         break;
     case InPaint: