Add a HostContentSettingsMap layer for Supervised Users.

components/content_settings/core/common/pref_names.cc

Index: components/content_settings/core/common/pref_names.cc
diff --git a/components/content_settings/core/common/pref_names.cc b/components/content_settings/core/common/pref_names.cc
index ef9b66cb12f7458568c84fa0bbfb4a25cdc8c932..41b2e83a729fc9f64483906788d95068c42c7443 100644
--- a/components/content_settings/core/common/pref_names.cc
+++ b/components/content_settings/core/common/pref_names.cc
@@ -78,4 +78,9 @@ const char kManagedNotificationsBlockedForUrls[] =
 const char kManagedAutoSelectCertificateForUrls[] =
     "profile.managed_auto_select_certificate_for_urls";
 
+const char kSupervisedGeolocationDisabled[] =

[Bernhard Bauer, 2015/02/05 12:07:52]

As previously discussed offline, I'm not sure if going through prefs here makes
anything easier. You could just as well directly observe the
SupervisedUserSettingsService instead.

[knn, 2015/02/26 12:07:30]

Done.

+    "profile.supervised_geolocation_disabled";
+const char kSupervisedCameraMicDisabled[] =
+    "profile.supervised_camera_mic_disabled";
+
 }  // namespace prefs