Add Incognito Navigation histograms

components/navigation_metrics/navigation_metrics.cc

 // Copyright 2013 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.
 
 #include "components/navigation_metrics/navigation_metrics.h"
 
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
 #include "url/gurl.h"
 
@@ skipping 58 matching lines @@
       UMA_HISTOGRAM_ENUMERATION("Navigation.SchemePerUniqueOrigin", scheme,
                                 SCHEME_MAX);
     }
   }
 
   UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameScheme", scheme, SCHEME_MAX);
   if (!is_in_page) {
     UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameSchemeDifferentPage", scheme,
                               SCHEME_MAX);
   }
+
+  if (is_off_the_record) {
+    UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameSchemeOTR", scheme,
+                              SCHEME_MAX);
+    if (!is_in_page) {
+      UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameSchemeDifferentPageOTR",
+                                scheme, SCHEME_MAX);
+    }
+  }
 }
 
 }  // namespace navigation_metrics