Make NetLog take in callbacks that return Values

net/http/http_response_headers.h

Index: net/http/http_response_headers.h
===================================================================
--- net/http/http_response_headers.h	(revision 141317)
+++ net/http/http_response_headers.h	(working copy)
@@ -13,6 +13,7 @@
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/net_export.h"
+#include "net/base/net_log.h"
 #include "net/http/http_version.h"
 
 class Pickle;
@@ -244,6 +245,18 @@
   // Returns true if the response is chunk-encoded.
   bool IsChunkEncoded() const;
 
+  // Creates a Value for use with the NetLog containing the response headers.
+  base::Value* NetLogCallback(NetLog::LogLevel log_level) const;
+
+  // Takes in a Value created by the above function, and attempts to create a
+  // copy of the original headers.  Returns true on success.  On failure,
+  // clears |http_response_headers|.
+  // TODO(mmenke):  Long term, we want to remove this, and migrate external
+  //                consumers to be NetworkDelegates.
+  static bool FromNetLogParam(
+      const base::Value* event_param,
+      scoped_refptr<HttpResponseHeaders>* http_response_headers);
+
   // Returns the HTTP response code.  This is 0 if the response code text seems
   // to exist but could not be parsed.  Otherwise, it defaults to 200 if the
   // response code is not found in the raw headers.