Add [CEReactions] IDL attributes for Custom Elements V1

third_party/WebKit/Source/core/dom/custom/CustomElement.cpp

Index: third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
index 12f220e68a603f372f802a8650c12b72121f9725..774930137779cae47f1be1d92b639009727b0dbb 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
@@ -6,6 +6,8 @@
 
 #include "core/dom/Document.h"
 #include "core/dom/QualifiedName.h"
+#include "core/dom/custom/CEReactionsScope.h"
+#include "core/dom/custom/CustomElementUpgradeReaction.h"
 #include "core/dom/custom/V0CustomElement.h"
 #include "core/dom/custom/V0CustomElementRegistrationContext.h"
 #include "core/frame/LocalDOMWindow.h"
@@ -98,4 +100,13 @@ HTMLElement* CustomElement::createCustomElement(Document& document, const Qualif
     return element;
 }
 
+void CustomElement::enqueueUpgradeReaction(Element* element, CustomElementDefinition* definition)
+{
+    // CEReactionsScope must be created by [CEReactions] in IDL,
+    // or callers must setup explicitly if it does not go through bindings.
+    DCHECK(CEReactionsScope::current());
+    CEReactionsScope::current()->enqueue(element,
+        new CustomElementUpgradeReaction(definition));
+}
+
 } // namespace blink