Introducing the WebServiceWorkerCache.

public/platform/WebServiceWorkerResponse.h

Index: public/platform/WebServiceWorkerResponse.h
diff --git a/public/platform/WebServiceWorkerResponse.h b/public/platform/WebServiceWorkerResponse.h
index 876b4eea9e7e0bec7ff77c327d54c7fa60d26327..e9de93a677dc3cbc66c62608a64343a9a6b97a65 100644
--- a/public/platform/WebServiceWorkerResponse.h
+++ b/public/platform/WebServiceWorkerResponse.h
@@ -23,6 +23,7 @@ class BlobDataHandle;
 
 namespace blink {
 
+class WebHTTPHeaderVisitor;
 class WebServiceWorkerResponsePrivate;
 
 // Represents a response to a fetch operation. ServiceWorker uses this to
@@ -32,6 +33,7 @@ class BLINK_PLATFORM_EXPORT WebServiceWorkerResponse {
 public:
     ~WebServiceWorkerResponse() { reset(); }
     WebServiceWorkerResponse();
+    WebServiceWorkerResponse(const WebServiceWorkerResponse& other) { assign(other); }
     WebServiceWorkerResponse& operator=(const WebServiceWorkerResponse& other)
     {
         assign(other);
@@ -53,6 +55,7 @@ public:
     void setHeader(const WebString& key, const WebString& value);
     WebVector<WebString> getHeaderKeys() const;
     WebString getHeader(const WebString& key) const;
+    void visitHTTPHeaderFields(WebHTTPHeaderVisitor*) const;
 
     WebString blobUUID() const;