Support embedded created Response objects in ServiceWorker.

Source/platform/exported/WebServiceWorkerResponse.cpp

Index: Source/platform/exported/WebServiceWorkerResponse.cpp
diff --git a/Source/platform/exported/WebServiceWorkerResponse.cpp b/Source/platform/exported/WebServiceWorkerResponse.cpp
index 79d29d9f32817f2b14432f8f4d22ae6701f19c63..f8232e15f93e48ac23ec3715fd623017ef3db0c4 100644
--- a/Source/platform/exported/WebServiceWorkerResponse.cpp
+++ b/Source/platform/exported/WebServiceWorkerResponse.cpp
@@ -6,6 +6,8 @@
 #include "public/platform/WebServiceWorkerResponse.h"
 
 #include "platform/blob/BlobData.h"
+#include "public/platform/WebHTTPHeaderVisitor.h"
+#include "wtf/HashMap.h"
 
 namespace blink {
 
@@ -14,6 +16,7 @@ public:
     WebURL url;
     unsigned short status;
     WebString statusText;
+    // FIXME: change headers to a data type that preserves order.
     HashMap<String, String> headers;
     RefPtr<BlobDataHandle> blobDataHandle;
 };
@@ -80,6 +83,12 @@ WebString WebServiceWorkerResponse::getHeader(const WebString& key) const
     return m_private->headers.get(key);
 }
 
+void WebServiceWorkerResponse::visitHTTPHeaderFields(WebHTTPHeaderVisitor* headerVisitor) const
+{
+    for (HashMap<String, String>::const_iterator i = m_private->headers.begin(), end = m_private->headers.end(); i != end; ++i)
+        headerVisitor->visitHeader(i->key, i->value);
+}
+
 WebString WebServiceWorkerResponse::blobUUID() const
 {
     if (!m_private->blobDataHandle)