Added HttpUtils::HasValidators and HttpResponse::HasValidators

net/http/http_util.h

Index: net/http/http_util.h
diff --git a/net/http/http_util.h b/net/http/http_util.h
index 1bb3c93f8ab168152dc75205e00aabcc0d9c30cf..e247e097d627f77d93e9a188cfc7557d7ce40ebd 100644
--- a/net/http/http_util.h
+++ b/net/http/http_util.h
@@ -203,6 +203,12 @@ class NET_EXPORT HttpUtil {
                                   const std::string& last_modified_header,
                                   const std::string& date_header);
 
+  // Returns true if the parameters describe a response with validators (either
+  // strong or weak).  See section 13.3.3 of RFC 2616.

[bengr, 2015/12/03 17:42:21]

I'd also add to the comment that it returns true specifically when the response
has Last-Modified or ETag.

[jamartin (wrong), 2015/12/08 16:58:18]

Done.

+  static bool HasValidators(HttpVersion version,
+                            const std::string& etag_header,
+                            const std::string& last_modified_header);
+
   // Gets a vector of common HTTP status codes for histograms of status
   // codes.  Currently returns everything in the range [100, 600), plus 0
   // (for invalid responses/status codes).