Implement contextmenu attribute with basic support of <menu>

Source/core/page/ContextMenuController.cpp

Index: Source/core/page/ContextMenuController.cpp
diff --git a/Source/core/page/ContextMenuController.cpp b/Source/core/page/ContextMenuController.cpp
index cd8b65b29a1ccda5d59d5bf3638542ef8f94489a..5c4d275a4408406fd5637079d9f1ec044a20e293 100644
--- a/Source/core/page/ContextMenuController.cpp
+++ b/Source/core/page/ContextMenuController.cpp
@@ -28,10 +28,14 @@
 #include "core/page/ContextMenuController.h"
 
 #include "core/dom/Document.h"
+#include "core/dom/Node.h"
 #include "core/events/Event.h"
+#include "core/events/EventDispatchMediator.h"
+#include "core/events/EventDispatcher.h"
 #include "core/events/MouseEvent.h"
-#include "core/dom/Node.h"
+#include "core/events/RelatedEvent.h"
 #include "core/frame/LocalFrame.h"
+#include "core/html/HTMLMenuElement.h"
 #include "core/page/ContextMenuClient.h"
 #include "core/page/ContextMenuProvider.h"
 #include "core/page/EventHandler.h"
@@ -40,6 +44,8 @@
 
 namespace WebCore {
 
+using namespace HTMLNames;
+
 ContextMenuController::ContextMenuController(Page*, ContextMenuClient* client)
     : m_client(client)
 {
@@ -80,6 +86,17 @@ void ContextMenuController::handleContextMenuEvent(Event* event)
     if (!m_contextMenu)
         return;
 
+    Node* node = event->target()->toNode();
+    if (node && node->isHTMLElement()) {
+        const HTMLElement& element = toHTMLElement(*event->target()->toNode());
+        if (RefPtr<HTMLMenuElement> menuElement = element.menuElement()) {
+            RefPtr<RelatedEvent> relatedEvent = RelatedEvent::create("show");

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

This should use EventTypeNames.

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

Done.

+            relatedEvent->setRelatedTarget(node);
+            EventDispatcher::dispatchEvent(menuElement.get(), EventDispatchMediator::create(relatedEvent.release()));

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

Are you sure it's safe to run script here? Who owns the ContextMenuController?
The script here can navigate the page and destroy the current document.

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

Done. The ContextMenuController is owned by Page. If the script navigate the
page and destroy the current document, then ContextMenuController does not
change. Do we still need async event here because we need to update the already
shown context menu in case of async event which makes the existing
implementation complex.

+            m_menuProvider = menuElement->customProvider();
+            m_menuProvider->populateContextMenu(m_contextMenu.get());
+        }
+    }
     showContextMenu(event);
 }