Add rappor metrics for messages received

BUG=466091

Review URL: https://codereview.chromium.org/1017183002

Cr-Commit-Position: refs/heads/master@{#321559}

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-

tools/metrics/rappor/rappor.xml

@@ -173,6 +173,13 @@ components/rappor/rappor_service.cc.
   </summary>
 </rappor-metric>
 
+<rappor-metric name="PushMessaging.MessageReceived.Origin" type="ETLD_PLUS_ONE">
+  <owner>miguelg@chromium.org</owner>
+  <summary>
+    Push Messages received per Origin.
+  </summary>
+</rappor-metric>
+
 <rappor-metric name="Search.DefaultSearchProvider" type="ETLD_PLUS_ONE">
   <owner>holte@chromium.org</owner>
   <summary>