Add a document phase for calculating paint properties

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

Index: third_party/WebKit/Source/core/dom/DocumentLifecycle.h
diff --git a/third_party/WebKit/Source/core/dom/DocumentLifecycle.h b/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
index d911f4fa4f11bb219a2cb82a35e6563223e1c49f..56819d93380396b77b142fa208a4e252b45f3488 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
@@ -67,6 +67,10 @@ public:
         InPaintInvalidation,
         PaintInvalidationClean,
 
+        // When RuntimeEnabledFeatures::slimmingPaintV2Enabled.
+        InCalcPaintProps,
+        CalcPaintPropsClean,
+
         // When RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled
         // (implied by slimmingPaintV2Enabled).
         InPaint,
@@ -170,6 +174,7 @@ inline bool DocumentLifecycle::stateAllowsTreeMutations() const
     return m_state != InStyleRecalc
         && m_state != InPerformLayout
         && m_state != InCompositingUpdate
+        && m_state != InCalcPaintProps
         && m_state != InPaint
         && m_state != InCompositingForSlimmingPaintV2;
 }
@@ -194,6 +199,7 @@ inline bool DocumentLifecycle::stateAllowsDetach() const
         || m_state == LayoutClean
         || m_state == CompositingClean
         || m_state == PaintInvalidationClean
+        || m_state == CalcPaintPropsClean
         || m_state == PaintClean
         || m_state == CompositingForSlimmingPaintV2Clean
         || m_state == Stopping;
@@ -204,6 +210,7 @@ inline bool DocumentLifecycle::stateAllowsLayoutInvalidation() const
     return m_state != InPerformLayout
         && m_state != InCompositingUpdate
         && m_state != InPaintInvalidation
+        && m_state != InCalcPaintProps
         && m_state != InPaint
         && m_state != InCompositingForSlimmingPaintV2;
 }