RAPPOR implementation

chrome/browser/prefs/pref_metrics_service.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 "chrome/browser/prefs/pref_metrics_service.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/prefs/synced_pref_change_registrar.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_prepopulate_data.h"
 #include "chrome/browser/ui/tabs/pinned_tab_codec.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
+#include "components/rappor/rappor_service.h"
 #include "crypto/hmac.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 
 namespace {
 
 const int kSessionStartupPrefValueMax = SessionStartupPref::kPrefValueMax;
 
 }  // namespace
 
 PrefMetricsService::PrefMetricsService(Profile* profile)
@@ skipping 28 matching lines @@
   if (show_home_button) {
     UMA_HISTOGRAM_BOOLEAN("Settings.GivenShowHomeButton_HomePageIsNewTabPage",
                           home_page_is_ntp);
   }
 
   // For non-NTP homepages, see if the URL comes from the same TLD+1 as a known
   // search engine.  Note that this is only an approximation of search engine
   // use, due to both false negatives (pages that come from unknown TLD+1 X but
   // consist of a search box that sends to known TLD+1 Y) and false positives
   // (pages that share a TLD+1 with a known engine but aren't actually search
-  // pages, e.g. plus.google.com).
+  // pages, e.g. plus.google.com).  Additionally, record the TLD+1 of non-NTP
+  // homepages through the privacy-preserving Rappor service.
   if (!home_page_is_ntp) {
     GURL homepage_url(prefs_->GetString(prefs::kHomePage));
     if (homepage_url.is_valid()) {
       UMA_HISTOGRAM_ENUMERATION(
           "Settings.HomePageEngineType",
           TemplateURLPrepopulateData::GetEngineType(homepage_url),
           SEARCH_ENGINE_MAX);
+      if (g_browser_process->rappor_service()) {
+        g_browser_process->rappor_service()->RecordSample(
+            "Settings.HomePage",
+            rappor::ETLD_PLUS_ONE_RAPPOR_TYPE,
+            net::registry_controlled_domains::GetDomainAndRegistry(homepage_url,
+                net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES));
+      }
     }
   }
 
   int restore_on_startup = prefs_->GetInteger(prefs::kRestoreOnStartup);
   UMA_HISTOGRAM_ENUMERATION("Settings.StartupPageLoadSettings",
                             restore_on_startup, kSessionStartupPrefValueMax);
   if (restore_on_startup == SessionStartupPref::kPrefValueURLs) {
     const base::ListValue* url_list =
         prefs_->GetList(prefs::kURLsToRestoreOnStartup);
     UMA_HISTOGRAM_CUSTOM_COUNTS("Settings.StartupPageLoadURLs",
@@ skipping 124 matching lines @@
 }
 
 bool PrefMetricsService::Factory::ServiceIsNULLWhileTesting() const {
   return false;
 }
 
 content::BrowserContext* PrefMetricsService::Factory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }