net: Notify the http job and cache transaction about a filter

net/http/http_transaction.h

Index: net/http/http_transaction.h
===================================================================
--- net/http/http_transaction.h	(revision 95711)
+++ net/http/http_transaction.h	(working copy)
@@ -96,6 +96,12 @@
   // Stops further caching of this request by the HTTP cache, if there is any.
   virtual void StopCaching() = 0;
 
+  // Called to tell the transaction that we have successfully reached the end
+  // of the stream. This is equivalent to performing an extra Read() at the end
+  // that should return 0 bytes. This method should not be called if the
+  // transaction is busy processing a previous operation (like a pending Read).
+  virtual void DoneReading() = 0;
+
   // Returns the response info for this transaction or NULL if the response
   // info is not available.
   virtual const HttpResponseInfo* GetResponseInfo() const = 0;