Surface button for loading stale cache copy on net error page.

chrome/common/net/net_error_info.cc

Index: chrome/common/net/net_error_info.cc
diff --git a/chrome/common/net/net_error_info.cc b/chrome/common/net/net_error_info.cc
index 91a1ca94bc973d5c38d0d2d2ac25cce35ce3ff6f..1a94bb7fd3ffffbe9990512dad9f60dec9f587dc 100644
--- a/chrome/common/net/net_error_info.cc
+++ b/chrome/common/net/net_error_info.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "chrome/common/net/net_error_info.h"
 
 namespace chrome_common_net {
@@ -36,4 +37,9 @@ bool DnsProbeStatusIsFinished(DnsProbeStatus status) {
          status < DNS_PROBE_MAX;
 }
 
+void RecordEvent(NetworkErrorPageEvent event) {
+  UMA_HISTOGRAM_ENUMERATION("Net.ErrorPageCounts", event,
+                            NET_ERROR_PAGE_EVENT_MAX);
+}
+
 }  // namespace chrome_common_net