ServiceWorker: support Request.{url,method,origin,headers} [blink] (1/3)

Source/modules/serviceworkers/HeaderMap.h

Index: Source/modules/serviceworkers/HeaderMap.h
diff --git a/Source/modules/serviceworkers/HeaderMap.h b/Source/modules/serviceworkers/HeaderMap.h
index 4f6fd9d02389c7351b418ee16fe2bb3a633b9ccf..3e5b47f567df5b2a6a43bbedb306ed5034928d16 100644
--- a/Source/modules/serviceworkers/HeaderMap.h
+++ b/Source/modules/serviceworkers/HeaderMap.h
@@ -19,6 +19,7 @@ class ScriptValue;
 class HeaderMap FINAL : public ScriptWrappable, public RefCounted<HeaderMap> {
 public:
     static PassRefPtr<HeaderMap> create();
+    static PassRefPtr<HeaderMap> create(const HashMap<String, String>& headers);
 
     // HeaderMap.idl implementation.
     unsigned long size() const;
@@ -34,6 +35,7 @@ public:
 
 private:
     HeaderMap();
+    explicit HeaderMap(const HashMap<String, String>& headers);
     void forEachInternal(PassOwnPtr<HeaderMapForEachCallback>, ScriptValue* thisArg);
 
     // FIXME: this doesn't preserve ordering while ES6 Map type requires it.