Display DNS probe results.

chrome/common/net/net_error_info.h

Index: chrome/common/net/net_error_info.h
diff --git a/chrome/common/net/net_error_info.h b/chrome/common/net/net_error_info.h
index 9f8d08a1baabe1b741fa69d2761ec50ff59ae667..de852e1b36634f49ef64a791b286bbcd2f5a1bb4 100644
--- a/chrome/common/net/net_error_info.h
+++ b/chrome/common/net/net_error_info.h
@@ -7,14 +7,47 @@
 
 namespace chrome_common_net {
 
-enum DnsProbeResult {
-  DNS_PROBE_UNKNOWN,
-  DNS_PROBE_NO_INTERNET,
-  DNS_PROBE_BAD_CONFIG,
-  DNS_PROBE_NXDOMAIN,
+// The status of a DNS probe that the NetErrorTabHelper may or may not have
+// started.
+enum DnsProbeStatus {
+  // A DNS probe may be run for this error page.  (This status is only used on
+  // the renderer side before it's received a status update from the browser.)
+  DNS_PROBE_POSSIBLE,
+
+  // A DNS probe will not be run for this error page.  (This happens if the
+  // user has the "Use web service to resolve navigation errors" preference
+  // turned off, or if probes are disabled by the field trial.)
+  DNS_PROBE_NOT_RUN,
+
+  // A DNS probe has been started for this error page.  The renderer should
+  // expect to receive another IPC with one of the FINISHED statuses once the
+  // probe has finished (as long as the error page is still loaded).
+  DNS_PROBE_STARTED,
+
+  // A DNS probe has finished with one of the following results:
+
+  // The probe was inconclusive..
+  DNS_PROBE_FINISHED_UNKNOWN,
+
+  // There's no internet connection.
+  DNS_PROBE_FINISHED_NO_INTERNET,
+
+  // The DNS configuration is wrong, or the servers are down or broken.
+  DNS_PROBE_FINISHED_BAD_CONFIG,
+
+  // The DNS servers are working fine, so the domain must not exist.
+  DNS_PROBE_FINISHED_NXDOMAIN,
+
   DNS_PROBE_MAX
 };
 
+const char* DnsProbeStatusToString(int status);
+bool DnsProbeStatusIsFinished(DnsProbeStatus status);
+
+bool DnsProbesEnabledByFieldTrial();
+
+extern const char kDnsProbeErrorDomain[];
+
 }  // namespace chrome_common_net
 
 #endif  // CHROME_COMMON_NET_NET_ERROR_INFO_H_