URLRequestContext and disk cache for media files

net/http/http_network_layer.h

Index: net/http/http_network_layer.h
diff --git a/net/http/http_network_layer.h b/net/http/http_network_layer.h
index 8424b2f1da32e8df1643c17242b83702dbe43892..a2bb491248db9729989ba2e8a861dd305f6ceb8b 100644
--- a/net/http/http_network_layer.h
+++ b/net/http/http_network_layer.h
@@ -19,17 +19,29 @@ class HttpNetworkLayer : public HttpTransactionFactory {
  public:
   // |proxy_service| must remain valid for the lifetime of HttpNetworkLayer.
   explicit HttpNetworkLayer(ProxyService* proxy_service);
+  // Construct a HttpNetworkLayer with an existing HttpNetworkSession which
+  // contains a valid ProxyService.
+  explicit HttpNetworkLayer(HttpNetworkSession* session);
   ~HttpNetworkLayer();
 
   // This function hides the details of how a network layer gets instantiated
   // and allows other implementations to be substituted.
   static HttpTransactionFactory* CreateFactory(ProxyService* proxy_service);
+  // Create a transaction factory that instantiate a network layer over an
+  // existing network session. Network session contains some valuable
+  // information (e.g. authentication data) that we want to share across
+  // multiple network layers. This method exposes the implementation details
+  // of a network layer, use this method with an existing network layer only
+  // when network session is shared.
+  static HttpTransactionFactory* CreateFactory(HttpNetworkSession* session);
 
   // HttpTransactionFactory methods:
   virtual HttpTransaction* CreateTransaction();
   virtual HttpCache* GetCache();
   virtual void Suspend(bool suspend);
 
+  HttpNetworkSession* GetSession();
+
  private:
   // The proxy service being used for the session.
   ProxyService* proxy_service_;