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

chrome/browser/profiles/profile_io_data.cc

 // 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.
 
 #include "chrome/browser/profiles/profile_io_data.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 850 matching lines @@
 
 ResourceContext::SaltCallback ProfileIOData::GetMediaDeviceIDSalt() const {
   return base::Bind(&MediaDeviceIDSalt::GetSalt, media_device_id_salt_);
 }
 
 bool ProfileIOData::IsOffTheRecord() const {
   return profile_type() == Profile::INCOGNITO_PROFILE
       || profile_type() == Profile::GUEST_PROFILE;
 }
 
+bool ProfileIOData::HaveAlreadySeenOrigin(const url::Origin& origin) {
+  return origins_seen_.insert(origin).second == false;
+}
+
 void ProfileIOData::InitializeMetricsEnabledStateOnUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #if BUILDFLAG(ANDROID_JAVA_UI)
   // TODO(dwkang): rename or unify the pref for UMA once we have conclusion
   // in crbugs.com/246495.
   // Android has it's own preferences for metrics / crash uploading.
   enable_metrics_.Init(prefs::kCrashReportingEnabled,
                        g_browser_process->local_state());
   enable_metrics_.MoveToThread(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
@@ skipping 446 matching lines @@
       base::WrapUnique(new DevToolsNetworkTransactionFactory(
           network_controller_handle_.GetController(), shared_session)),
       std::move(backend), true /* set_up_quic_server_info */));
 }
 
 void ProfileIOData::SetCookieSettingsForTesting(
     content_settings::CookieSettings* cookie_settings) {
   DCHECK(!cookie_settings_.get());
   cookie_settings_ = cookie_settings;
 }