Start changing WebDOMMessageEvent for using target execution context.

Source/web/WebDOMMessageEvent.cpp

Index: Source/web/WebDOMMessageEvent.cpp
diff --git a/Source/web/WebDOMMessageEvent.cpp b/Source/web/WebDOMMessageEvent.cpp
index 573ae5495198011867ed41ef341f4c9b3239de4f..3e172dc5af2a526033273f70d87a73216d2ccab3 100644
--- a/Source/web/WebDOMMessageEvent.cpp
+++ b/Source/web/WebDOMMessageEvent.cpp
@@ -37,24 +37,25 @@
 #include "core/events/MessageEvent.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "public/platform/WebString.h"
+#include "public/web/WebDocument.h"
 #include "public/web/WebFrame.h"
 #include "public/web/WebSerializedScriptValue.h"
 #include "web/WebLocalFrameImpl.h"
 
 namespace blink {
 
-void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble, bool cancelable, const WebSerializedScriptValue& messageData, const WebString& origin, const WebFrame* sourceFrame, const WebString& lastEventId, const WebMessagePortChannelArray& webChannels)
+void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble, bool cancelable, const WebSerializedScriptValue& messageData, const WebString& origin, const WebFrame* sourceFrame, const WebDocument& targetDocument, const WebString& lastEventId, const WebMessagePortChannelArray& webChannels)
 {
     ASSERT(m_private.get());
     ASSERT(isMessageEvent());
     DOMWindow* window = nullptr;
-    // TODO(alexmos): Figure out if this is the right thing to do.
     if (sourceFrame)
         window = toCoreFrame(sourceFrame)->domWindow();
     MessagePortArray* ports = nullptr;
-    // TODO(alexmos): make ports work properly with OOPIF.
-    if (sourceFrame && sourceFrame->isWebLocalFrame())
-        ports = MessagePort::toMessagePortArray(toLocalDOMWindow(window)->document(), webChannels);
+    if (!targetDocument.isNull()) {
+        RefPtrWillBeRawPtr<Document> coreDocument = PassRefPtrWillBeRawPtr<Document>(targetDocument);
+        ports = MessagePort::toMessagePortArray(coreDocument.get(), webChannels);
+    }
     // Use an empty array for |ports| when it is null because this function
     // is used to implement postMessage().
     if (!ports)
@@ -62,6 +63,16 @@ void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble,
     unwrap<MessageEvent>()->initMessageEvent(type, canBubble, cancelable, messageData, origin, lastEventId, window, ports);
 }
 
+void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble, bool cancelable, const WebSerializedScriptValue& messageData, const WebString& origin, const WebFrame* sourceFrame, const WebString& lastEventId, const WebMessagePortChannelArray& webChannels)
+{
+    WebDocument document;
+    if (sourceFrame && sourceFrame->isWebLocalFrame()) {
+        DOMWindow* window = toCoreFrame(sourceFrame)->domWindow();
+        document = toLocalDOMWindow(window)->document();
+    }
+    initMessageEvent(type, canBubble, cancelable, messageData, origin, sourceFrame, document, lastEventId, webChannels);
+}
+
 WebSerializedScriptValue WebDOMMessageEvent::data() const
 {
     return WebSerializedScriptValue(constUnwrap<MessageEvent>()->dataAsSerializedScriptValue());