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

net/url_request/url_request_http_job.cc

Index: net/url_request/url_request_http_job.cc
diff --git a/net/url_request/url_request_http_job.cc b/net/url_request/url_request_http_job.cc
index 2155ea9a54e0c1264b0556580c9e41dd468e8ef2..6565a8dcb8608e759f08b56c6a0b0c033b7e81cc 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -484,6 +484,17 @@ void URLRequestHttpJob::StartTransactionInternal() {
   // If we already have a transaction, then we should restart the transaction
   // with auth provided by auth_credentials_.
 
+  bool invalid_header_values_in_rfc7230 = false;
+  for (HttpRequestHeaders::Iterator it(request_info_.extra_headers);
+       it.GetNext();) {
+    if (!HttpUtil::IsValidHeaderValueRFC7230(it.value())) {
+      invalid_header_values_in_rfc7230 = true;
+      break;
+    }
+  }
+  UMA_HISTOGRAM_BOOLEAN("Net.HttpRequest.ContainsInvalidHeaderValuesInRFC7230",
+                        invalid_header_values_in_rfc7230);
+
   int rv;
 
   if (network_delegate()) {
@@ -928,6 +939,23 @@ void URLRequestHttpJob::OnStartCompleted(int result) {
       SetProxyServer(transaction_->GetResponseInfo()->proxy_server);
     }
     scoped_refptr<HttpResponseHeaders> headers = GetResponseHeaders();
+
+    if (headers) {
+      void* iter = NULL;
+      std::string name;
+      std::string value;
+      bool invalid_header_values_in_rfc7230 = false;
+      while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
+        if (!HttpUtil::IsValidHeaderValueRFC7230(value)) {
+          invalid_header_values_in_rfc7230 = true;
+          break;
+        }
+      }
+      UMA_HISTOGRAM_BOOLEAN(
+          "Net.HttpResponse.ContainsInvalidHeaderValuesInRFC7230",
+          invalid_header_values_in_rfc7230);
+    }
+
     if (network_delegate()) {
       // Note that |this| may not be deleted until
       // |on_headers_received_callback_| or