Add blink-side plumbing for ServiceWorker -> Document postMessage (1/3)

Source/modules/serviceworkers/ServiceWorkerContainer.cpp

Index: Source/modules/serviceworkers/ServiceWorkerContainer.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerContainer.cpp b/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
index 56fc12874424b70eea4fa86d10e5462c38ac5222..c4f5c07915dfafe8fcc55491dd95ccf1556583ba 100644
--- a/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
@@ -34,9 +34,13 @@
 #include "bindings/v8/CallbackPromiseAdapter.h"
 #include "bindings/v8/ScriptPromiseResolverWithContext.h"
 #include "bindings/v8/ScriptState.h"
+#include "bindings/v8/SerializedScriptValue.h"
 #include "core/dom/DOMException.h"
+#include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
+#include "core/dom/MessagePort.h"
+#include "core/events/MessageEvent.h"
 #include "modules/serviceworkers/RegistrationOptionList.h"
 #include "modules/serviceworkers/ServiceWorker.h"
 #include "modules/serviceworkers/ServiceWorkerContainerClient.h"
@@ -140,8 +144,19 @@ void ServiceWorkerContainer::setCurrentServiceWorker(blink::WebServiceWorker* se
     m_current = ServiceWorker::create(executionContext(), adoptPtr(serviceWorker));
 }
 
+void ServiceWorkerContainer::dispatchMessageEvent(const blink::WebString& message, const blink::WebMessagePortChannelArray& webChannels)
+{
+    if (!executionContext() || !window())
+        return;
+
+    OwnPtr<MessagePortArray> ports = MessagePort::toMessagePortArray(executionContext(), webChannels);
+    RefPtr<SerializedScriptValue> value = SerializedScriptValue::createFromWire(message);
+    window()->dispatchEvent(MessageEvent::create(ports.release(), value));
+}
+
 ServiceWorkerContainer::ServiceWorkerContainer(ExecutionContext* executionContext)
     : ContextLifecycleObserver(executionContext)
+    , DOMWindowLifecycleObserver(executionContext->isDocument() ? toDocument(executionContext)->domWindow() : 0)
     , m_provider(0)
 {
     ScriptWrappable::init(this);