[WIP]Implement Blink side changes for navigator.language(s) support for workers.

Source/core/workers/WorkerMessagingProxy.cpp

Index: Source/core/workers/WorkerMessagingProxy.cpp
diff --git a/Source/core/workers/WorkerMessagingProxy.cpp b/Source/core/workers/WorkerMessagingProxy.cpp
index aef742dc48bceaef9d5efec621b478b2daecc96a..59f58777f4b579df1ee79c7ec419e4fdb7d1f291 100644
--- a/Source/core/workers/WorkerMessagingProxy.cpp
+++ b/Source/core/workers/WorkerMessagingProxy.cpp
@@ -37,6 +37,7 @@
 #include "core/frame/FrameConsole.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Navigator.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "core/inspector/WorkerDebuggerAgent.h"
@@ -47,8 +48,10 @@
 #include "core/workers/Worker.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerInspectorProxy.h"
+#include "core/workers/WorkerLanguageTasks.h"
 #include "core/workers/WorkerObjectProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
+#include "platform/Language.h"
 #include "platform/NotImplemented.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Functional.h"
@@ -199,6 +202,9 @@ void WorkerMessagingProxy::workerThreadCreated(PassRefPtr<DedicatedWorkerThread>
     ASSERT(!m_askedToTerminate);
     m_workerThread = workerThread;
 
+    // Before any other task, pass on ua languages vector to the thread.
+    m_workerThread->postTask(WorkerThreadSetUserPreferredLanguagesTask::create(m_executionContext->executingWindow()->navigator().languages()));
+
     unsigned taskCount = m_queuedEarlyTasks.size();
     ASSERT(!m_unconfirmedMessageCount);
     m_unconfirmedMessageCount = taskCount;