Add a Rappor option in the settings page.

chrome/browser/policy/configuration_policy_handler_list_factory.cc

Index: chrome/browser/policy/configuration_policy_handler_list_factory.cc
diff --git a/chrome/browser/policy/configuration_policy_handler_list_factory.cc b/chrome/browser/policy/configuration_policy_handler_list_factory.cc
index 8f93f618c96e8d05f9712b85179ca9ce241ba193..46b96ee7f6a9847fcfc1dab6053a046f3d977668 100644
--- a/chrome/browser/policy/configuration_policy_handler_list_factory.cc
+++ b/chrome/browser/policy/configuration_policy_handler_list_factory.cc
@@ -23,6 +23,7 @@
 #include "components/policy/core/common/policy_map.h"
 #include "components/policy/core/common/policy_pref_names.h"
 #include "components/policy/core/common/schema.h"
+#include "components/rappor/rappor_pref_names.h"
 #include "components/search_engines/default_search_policy_handler.h"
 #include "components/translate/core/common/translate_pref_names.h"
 #include "policy/policy_constants.h"
@@ -119,6 +120,9 @@ const PolicyToPreferenceMapEntry kSimplePolicyMap[] = {
   { key::kMetricsReportingEnabled,
     prefs::kMetricsReportingEnabled,
     base::Value::TYPE_BOOLEAN },
+  { key::kMetricsReportingEnabled,
+    rappor::prefs::kRapporEnabled,
+    base::Value::TYPE_BOOLEAN },

[Mattias Nissler (ping if slow), 2015/02/10 08:38:15]

We need to be careful here w.r.t. installations that already have
key::kMetricsReportingEnabled. Given that we have two separate options in
chrome://settings, does it make sense to subsume them both under the same policy
knob?

I assume rappor::prefs::kRapporEnabled toggles RAPPOR entirely? Can you provide
some background on what led to the decision to have to separate pref settings
for metrics reporting and RAPPOR for the consumer experience to help decide and
justify what the enterprise policy behavior should be?

Side note: If we do decide to subsume RAPPOR in kMetricsReportingEnabled, then
you should also update the policy description in
components/policy/resources/policy_templates.json to mention RAPPOR.

   { key::kApplicationLocaleValue,
     prefs::kApplicationLocale,
     base::Value::TYPE_STRING },