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

components/gcm_driver/gcm_stats_recorder_impl.cc

Index: components/gcm_driver/gcm_stats_recorder_impl.cc
diff --git a/components/gcm_driver/gcm_stats_recorder_impl.cc b/components/gcm_driver/gcm_stats_recorder_impl.cc
index de3035459fe791c89c695edaca83207f2465aa55..803e6baff0c2adbac480c48957c234375f58f408 100644
--- a/components/gcm_driver/gcm_stats_recorder_impl.cc
+++ b/components/gcm_driver/gcm_stats_recorder_impl.cc
@@ -163,6 +163,7 @@ void GCMStatsRecorderImpl::Clear() {
   registration_activities_.clear();
   receiving_activities_.clear();
   sending_activities_.clear();
+  decryption_failure_activities_.clear();
 }
 
 void GCMStatsRecorderImpl::NotifyActivityRecorded() {
@@ -170,6 +171,22 @@ void GCMStatsRecorderImpl::NotifyActivityRecorded() {
     delegate_->OnActivityRecorded();
 }
 
+void GCMStatsRecorderImpl::RecordDecryptionFailure(
+    const std::string& app_id,
+    GCMEncryptionProvider::DecryptionFailure reason) {
+  if (!is_recording_)
+    return;
+
+  DecryptionFailureActivity data;
+  DecryptionFailureActivity* inserted_data = InsertCircularBuffer(
+      &decryption_failure_activities_, data);
+  inserted_data->app_id = app_id;
+  inserted_data->details =
+      GCMEncryptionProvider::ToDecryptionFailureDetailsString(reason);
+
+  NotifyActivityRecorded();
+}
+
 void GCMStatsRecorderImpl::RecordCheckin(
     const std::string& event,
     const std::string& details) {
@@ -460,6 +477,10 @@ void GCMStatsRecorderImpl::CollectActivities(
       recorded_activities->sending_activities.begin(),
       sending_activities_.begin(),
       sending_activities_.end());
+  recorded_activities->decryption_failure_activities.insert(
+      recorded_activities->decryption_failure_activities.begin(),
+      decryption_failure_activities_.begin(),
+      decryption_failure_activities_.end());
 }
 
 void GCMStatsRecorderImpl::RecordSending(const std::string& app_id,