RAPPOR implementation

chrome/browser/prefs/pref_metrics_service.cc

Index: chrome/browser/prefs/pref_metrics_service.cc
diff --git a/chrome/browser/prefs/pref_metrics_service.cc b/chrome/browser/prefs/pref_metrics_service.cc
index 6bbfa4aa0a7e61e98e8097d4662c3c2a15046e41..ae2c9d791ff3b7cbac10e672d072d9867f77e0ed 100644
--- a/chrome/browser/prefs/pref_metrics_service.cc
+++ b/chrome/browser/prefs/pref_metrics_service.cc
@@ -28,6 +28,8 @@
 #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_recorder.h"
+#include "components/rappor/rappor_utils.h"
 #include "crypto/hmac.h"
 #include "grit/browser_resources.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
@@ -71,6 +73,15 @@ const char* kTrackedPrefs[] = {
 
 const size_t kSHA256DigestSize = 32;
 
+const rappor::RapporParameters kHomePageRapporParameters = {
+    "Settings.HomePage", 16 /* Bloom filter size bytes */,
+    4 /* Bloom filter hash count */,
+    rappor::PROBABILITY_75 /* Fake data probability */,
+    rappor::PROBABILITY_50 /* Fake one probability */,
+    rappor::PROBABILITY_75 /* One coin probability */,
+    rappor::PROBABILITY_50 /* Zero coin probability */
+};
+
 }  // namespace
 
 PrefMetricsService::PrefMetricsService(Profile* profile)
@@ -151,6 +162,9 @@ void PrefMetricsService::RecordLaunchPrefs() {
           "Settings.HomePageEngineType",
           TemplateURLPrepopulateData::GetEngineType(homepage_url),
           SEARCH_ENGINE_MAX);
+      std::vector<std::string> url_parts;
+      rappor::GetUrlParts(homepage_url, &url_parts);
+      RAPPOR_SAMPLES(&kHomePageRapporParameters, url_parts);
     }
   }