Move shadowCascadeOrder to Document from StyleEngine

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index e395f5019c5109fd4935bca12118138f2ae34e32..f8ae24c5cf94efb34d2df18322ba2dda0b63a7b0 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -5962,6 +5962,24 @@ void Document::enforceStrictMixedContentChecking()
         frame()->loader().client()->didEnforceStrictMixedContentChecking();
 }
 
+void Document::setShadowCascadeOrder(ShadowCascadeOrder order)
+{
+    DCHECK_NE(order, ShadowCascadeOrder::ShadowCascadeNone);
+
+    if (order == m_shadowCascadeOrder)
+        return;
+
+    if (order == ShadowCascadeOrder::ShadowCascadeV0)
+        m_mayContainV0Shadow = true;
+
+    // For V0 -> V1 upgrade, we need style recalculation for the whole document.
+    if (m_shadowCascadeOrder == ShadowCascadeOrder::ShadowCascadeV0 && order == ShadowCascadeOrder::ShadowCascadeV1)
+        this->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::Shadow));
+
+    if (order > m_shadowCascadeOrder)
+        m_shadowCascadeOrder = order;
+}
+
 LayoutViewItem Document::layoutViewItem() const
 {
     return LayoutViewItem(m_layoutView);