Propagate inherited properties into slotted elements on recalc.

third_party/WebKit/Source/core/html/HTMLSlotElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLSlotElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLSlotElement.cpp b/third_party/WebKit/Source/core/html/HTMLSlotElement.cpp
index 2fa0a8ddcda2544784bae1ab2d174b9588abdf70..b694c014da6ea8c718477c86838cb7dcb9685e45 100644
--- a/third_party/WebKit/Source/core/html/HTMLSlotElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLSlotElement.cpp
@@ -45,6 +45,7 @@ using namespace HTMLNames;
 inline HTMLSlotElement::HTMLSlotElement(Document& document)
     : HTMLElement(slotTag, document)
 {
+    setHasCustomStyleCallbacks();
 }
 
 DEFINE_NODE_FACTORY(HTMLSlotElement);
@@ -214,6 +215,15 @@ void HTMLSlotElement::removedFrom(ContainerNode* insertionPoint)
     HTMLElement::removedFrom(insertionPoint);
 }
 
+void HTMLSlotElement::willRecalcStyle(StyleRecalcChange change)
+{
+    if (change < Inherit && styleChangeType() < SubtreeStyleChange)
+        return;
+
+    for (auto& node : m_distributedNodes)
+        node->setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::PropagateInheritChangeToDistributedNodes));
+}
+
 void HTMLSlotElement::updateDistributedNodesWithFallback()
 {
     if (!m_distributedNodes.isEmpty())