Add UMAs for checking header values against RFC 7230 in //net

net/http/http_response_headers.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The rules for header parsing were borrowed from Firefox:
 // http://lxr.mozilla.org/seamonkey/source/netwerk/protocol/http/src/nsHttpResponseHead.cpp
 // The rules for parsing content-types were also borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_response_headers.h"
@@ skipping 752 matching lines @@
     }
   }
 
   return false;
 }
 
 void HttpResponseHeaders::AddHeader(std::string::const_iterator name_begin,
                                     std::string::const_iterator name_end,
                                     std::string::const_iterator values_begin,
                                     std::string::const_iterator values_end) {
+  UMA_HISTOGRAM_BOOLEAN(
+      "Net.HttpResponseHeaderValueValidInRFC7230",
+      HttpUtil::IsValidHeaderValueRFC7230(values_begin, values_end));
+
   // If the header can be coalesced, then we should split it up.
   if (values_begin == values_end ||
       HttpUtil::IsNonCoalescingHeader(name_begin, name_end)) {
     AddToParsed(name_begin, name_end, values_begin, values_end);
   } else {
     HttpUtil::ValuesIterator it(values_begin, values_end, ',');
     while (it.GetNext()) {
       AddToParsed(name_begin, name_end, it.value_begin(), it.value_end());
       // clobber these so that subsequent values are treated as continuations
       name_begin = name_end = raw_headers_.end();
@@ skipping 650 matching lines @@
   return true;
 }
 
 bool HttpResponseHeaders::IsChunkEncoded() const {
   // Ignore spurious chunked responses from HTTP/1.0 servers and proxies.
   return GetHttpVersion() >= HttpVersion(1, 1) &&
       HasHeaderValue("Transfer-Encoding", "chunked");
 }
 
 }  // namespace net