Process Custom Elements in post-order.

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 17776ecb050eb538526cb03c27d9101046ef558a..291c59c1f4725c23a310c014b5c4efa75c7e2ba9 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -2732,18 +2732,22 @@ void Node::setCustomElementState(CustomElementState newState)
         ASSERT_NOT_REACHED(); // Everything starts in this state
         return;
 
-    case WaitingForUpgrade:
+    case WaitingForParser:
         ASSERT(NotCustomElement == oldState);
         break;
 
+    case WaitingForUpgrade:
+        ASSERT(NotCustomElement == oldState || WaitingForParser == oldState);
+        break;
+
     case Upgraded:
-        ASSERT(WaitingForUpgrade == oldState);
+        ASSERT(WaitingForParser == oldState || WaitingForUpgrade == oldState);
         break;
     }
 
     ASSERT(isHTMLElement() || isSVGElement());
-    setFlag(newState & 1, CustomElementWaitingForUpgrade);
-    setFlag(newState & 2, CustomElementIsUpgraded);
+    setFlag(newState & 1, CustomElementWaitingForParserOrIsUpgraded);
+    setFlag(newState & 2, CustomElementWaitingForUpgradeOrIsUpgraded);
 
     if (oldState == NotCustomElement || newState == Upgraded)
         setNeedsStyleRecalc(); // :unresolved has changed