Implement contextmenu attribute with basic support of <menu>

Source/core/html/HTMLMenuElementEventListener.cpp

Index: Source/core/html/HTMLMenuElementEventListener.cpp
diff --git a/Source/core/html/HTMLMenuElementEventListener.cpp b/Source/core/html/HTMLMenuElementEventListener.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c7e3e2320dc5264ecbed97d65bd689f71303327b
--- /dev/null
+++ b/Source/core/html/HTMLMenuElementEventListener.cpp
@@ -0,0 +1,42 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "core/html/HTMLMenuElementEventListener.h"
+
+#include "core/events/RelatedEvent.h"
+
+namespace WebCore {
+
+void HTMLMenuElementEventListener::handleEvent(ExecutionContext*, Event* event)

[esprehn, 2014/06/06 22:30:42]

This should be in the defaultEventHandler, we don't add EventListeners in C++ to
my knowledge.

[pals, 2014/06/10 10:42:39]

Done.

+{
+    if (event->type() == EventTypeNames::show && toRelatedEvent(event)->isRelatedEvent()) {
+        Node* node = toRelatedEvent(event)->relatedTarget()->toNode();
+        if (node && node->isHTMLElement()) {
+            const HTMLElement& element = toHTMLElement(*node);
+            HTMLMenuElement* menuElement = element.menuElement();
+            if (menuElement) {
+                menuElement->ensureCustomProvider();
+                event->setDefaultHandled();
+            }
+        }
+    }
+}
+
+bool HTMLMenuElementEventListener::operator==(const EventListener& listener)
+{
+    if (const HTMLMenuElementEventListener* menuEventListener = toHTMLMenuElementEventListener(&listener))
+        return m_menu == menuEventListener->m_menu;
+    return false;
+}
+
+const HTMLMenuElementEventListener* toHTMLMenuElementEventListener(const EventListener* listener)
+{
+    return listener->type() == EventListener::NativeEventListenerType
+        ? static_cast<const HTMLMenuElementEventListener*>(listener)
+        : 0;
+}
+
+}