Added UMA records for OOBE portal detection.

chrome/browser/chromeos/net/network_portal_detector.h

Index: chrome/browser/chromeos/net/network_portal_detector.h
diff --git a/chrome/browser/chromeos/net/network_portal_detector.h b/chrome/browser/chromeos/net/network_portal_detector.h
index c636b1f29a46879f9fae6f45d9e3c1315a77a9d2..1c68a0ad83ad5a1b7c225c4568a24df741b61518 100644
--- a/chrome/browser/chromeos/net/network_portal_detector.h
+++ b/chrome/browser/chromeos/net/network_portal_detector.h
@@ -44,7 +44,8 @@ class NetworkPortalDetector
     CAPTIVE_PORTAL_STATUS_OFFLINE  = 1,
     CAPTIVE_PORTAL_STATUS_ONLINE   = 2,
     CAPTIVE_PORTAL_STATUS_PORTAL   = 3,
-    CAPTIVE_PORTAL_STATUS_PROXY_AUTH_REQUIRED = 4
+    CAPTIVE_PORTAL_STATUS_PROXY_AUTH_REQUIRED = 4,
+    CAPTIVE_PORTAL_STATUS_COUNT
   };
 
   struct CaptivePortalState {
@@ -213,6 +214,9 @@ class NetworkPortalDetector
   // active network.
   base::TimeDelta min_time_between_attempts_;
 
+  // Start time of portal detection.
+  base::TimeTicks detection_start_time_;
+
   // Start time of portal detection attempt.
   base::TimeTicks attempt_start_time_;