Introducing the WebServiceWorkerCache.

public/platform/WebServiceWorkerRequest.h

Index: public/platform/WebServiceWorkerRequest.h
diff --git a/public/platform/WebServiceWorkerRequest.h b/public/platform/WebServiceWorkerRequest.h
index 0d72d00330e1a4fe7a5dad67e76beb941f40be57..0e4ab6f00eb43968b7cbb79e6b25e4aa6fad1287 100644
--- a/public/platform/WebServiceWorkerRequest.h
+++ b/public/platform/WebServiceWorkerRequest.h
@@ -21,6 +21,7 @@
 
 namespace blink {
 
+class WebHTTPHeaderVisitor;
 class WebServiceWorkerRequestPrivate;
 
 // Represents a request of a fetch operation. FetchEvent dispatched by the
@@ -30,6 +31,7 @@ class BLINK_PLATFORM_EXPORT WebServiceWorkerRequest {
 public:
     ~WebServiceWorkerRequest() { reset(); }
     WebServiceWorkerRequest();
+    WebServiceWorkerRequest(const WebServiceWorkerRequest& other) { assign(other); }
     WebServiceWorkerRequest& operator=(const WebServiceWorkerRequest& other)
     {
         assign(other);
@@ -46,8 +48,10 @@ public:
     WebString method() const;
 
     void setHeader(const WebString& key, const WebString& value);
+    void visitHTTPHeaderFields(WebHTTPHeaderVisitor*) const;
 
     void setReferrer(const WebString&, WebReferrerPolicy);
+    WebURL referrerUrl() const;
 
     void setIsReload(bool);
     bool isReload() const;