Histogram the scheme of an origin on the 1st navigation to it.

chrome/browser/profiles/profile_io_data.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 186 matching lines @@
 
   bool use_system_key_slot() const { return use_system_key_slot_; }
 #endif
 
   Profile::ProfileType profile_type() const {
     return profile_type_;
   }
 
   bool IsOffTheRecord() const;
 
+  // In OffTheRecord profiles, we want to record a version of the
+  // Navigation.MainFrameScheme[DifferentPage] UMA histogram. The difference is
+  // that we only do it for the first time each origin is navigated to. For
+  // non-OTR profiles, this method is never called.
+  virtual bool HaveAlreadySeenOrigin(const url::Origin& origin);
+
   IntegerPrefMember* incognito_availibility() const {
     return &incognito_availibility_pref_;
   }
 
   chrome_browser_net::ResourcePrefetchPredictorObserver*
       resource_prefetch_predictor_observer() const {
     return resource_prefetch_predictor_observer_.get();
   }
 
   policy::PolicyHeaderIOHelper* policy_header_helper() const {
@@ skipping 377 matching lines @@
 
   // TODO(jhawkins): Remove once crbug.com/102004 is fixed.
   bool initialized_on_UI_thread_;
 
   const Profile::ProfileType profile_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_