Add rappor metrics for messages received

chrome/browser/push_messaging/push_messaging_service_impl.cc

Index: chrome/browser/push_messaging/push_messaging_service_impl.cc
diff --git a/chrome/browser/push_messaging/push_messaging_service_impl.cc b/chrome/browser/push_messaging/push_messaging_service_impl.cc
index ba3e2da1db3a0e836d942101fc94adf59996b690..251e85a38a633f15b1ee0ee62699196e0c8a8b7d 100644
--- a/chrome/browser/push_messaging/push_messaging_service_impl.cc
+++ b/chrome/browser/push_messaging/push_messaging_service_impl.cc
@@ -34,6 +34,7 @@
 #include "components/content_settings/core/common/permission_request_id.h"
 #include "components/gcm_driver/gcm_driver.h"
 #include "components/pref_registry/pref_registry_syncable.h"
+#include "components/rappor/rappor_utils.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
@@ -200,6 +201,11 @@ void PushMessagingServiceImpl::OnMessage(
     return;
   }
 
+  rappor::SampleDomainAndRegistryFromGURL(
+      g_browser_process->rappor_service(),
+      "PushMessaging.MessageReceived.Origin",
+      application_id.origin());
+
   // The Push API only exposes a single string of data in the push event fired
   // on the Service Worker. When developers send messages using GCM to the Push
   // API and want to include a message payload, they must pass a single key-