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

components/gcm_driver/fake_gcm_client.cc

Index: components/gcm_driver/fake_gcm_client.cc
diff --git a/components/gcm_driver/fake_gcm_client.cc b/components/gcm_driver/fake_gcm_client.cc
index 9c1e3925f9ed889713878653a3bf0ce20d89afa7..ecd7f357bad5caeddcf8909007df8ab76cc81f1b 100644
--- a/components/gcm_driver/fake_gcm_client.cc
+++ b/components/gcm_driver/fake_gcm_client.cc
@@ -158,14 +158,26 @@ void FakeGCMClient::Send(const std::string& app_id,
                             weak_ptr_factory_.GetWeakPtr(), app_id, message));
 }
 
+void FakeGCMClient::RecordDecryptionFailure(
+    const std::string& app_id,
+    GCMEncryptionProvider::DecryptionFailure reason) {
+  recorder_.RecordDecryptionFailure(app_id, reason);
+}
+
 void FakeGCMClient::SetRecording(bool recording) {
+  recorder_.set_is_recording(recording);
 }
 
 void FakeGCMClient::ClearActivityLogs() {
+  recorder_.Clear();
 }
 
 GCMClient::GCMStatistics FakeGCMClient::GetStatistics() const {
-  return GCMClient::GCMStatistics();
+  GCMClient::GCMStatistics statistics;
+  statistics.is_recording = recorder_.is_recording();
+
+  recorder_.CollectActivities(&statistics.recorded_activities);
+  return statistics;
 }
 
 void FakeGCMClient::SetAccountTokens(