Always check if providers have initial stability metrics.

components/metrics/test_metrics_provider.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/metrics/test_metrics_provider.h"
 
 #include "base/metrics/histogram_macros.h"
 
 namespace metrics {
 
 void TestMetricsProvider::Init() {
   init_called_ = true;
 }
 
 void TestMetricsProvider::OnRecordingDisabled() {
   on_recording_disabled_called_ = true;
 }
 
 bool TestMetricsProvider::HasInitialStabilityMetrics() {
+  has_initial_stability_metrics_called_ = true;
   return has_initial_stability_metrics_;
 }
 
 void TestMetricsProvider::ProvideInitialStabilityMetrics(
     SystemProfileProto* system_profile_proto) {
   UMA_STABILITY_HISTOGRAM_ENUMERATION("TestMetricsProvider.Initial", 1, 2);
   provide_initial_stability_metrics_called_ = true;
 }
 
 void TestMetricsProvider::ProvideStabilityMetrics(
     SystemProfileProto* system_profile_proto) {
   UMA_STABILITY_HISTOGRAM_ENUMERATION("TestMetricsProvider.Regular", 1, 2);
   provide_stability_metrics_called_ = true;
 }
 
 }  // namespace metrics