List message decryption failures on chrome://gcm-internals

components/gcm_driver/gcm_activity.h

Index: components/gcm_driver/gcm_activity.h
diff --git a/components/gcm_driver/gcm_activity.h b/components/gcm_driver/gcm_activity.h
index 55c12901315e42569c920d1affd8d77d2773352e..fb1c2292b83ea10ee9b44bab4d97fd8946ff4642 100644
--- a/components/gcm_driver/gcm_activity.h
+++ b/components/gcm_driver/gcm_activity.h
@@ -64,6 +64,14 @@ struct SendingActivity : Activity {
   std::string message_id;
 };
 
+// Contains relevant data of a message decryption failure.
+struct DecryptionFailureActivity : Activity {
+  DecryptionFailureActivity();
+  ~DecryptionFailureActivity() override;
+
+  std::string app_id;
+};
+
 struct RecordedActivities {
   RecordedActivities();
   virtual ~RecordedActivities();
@@ -73,6 +81,7 @@ struct RecordedActivities {
   std::vector<RegistrationActivity> registration_activities;
   std::vector<ReceivingActivity> receiving_activities;
   std::vector<SendingActivity> sending_activities;
+  std::vector<DecryptionFailureActivity> decryption_failure_activities;
 };
 
 }  // namespace gcm