Introduce MetricsServiceClient::StartGatheringMetrics

components/metrics/test_metrics_service_client.cc

 // Copyright 2014 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_service_client.h"
 
 #include "base/callback.h"
 
 namespace metrics {
 
@@ skipping 27 matching lines @@
   return SystemProfileProto::CHANNEL_BETA;
 }
 
 std::string TestMetricsServiceClient::GetVersionString() {
   return "5.0.322.0-64-devel";
 }
 
 void TestMetricsServiceClient::OnLogUploadComplete() {
 }
 
+void TestMetricsServiceClient::StartGatheringMetrics(
+    const base::Closure& done_callback) {
+  done_callback.Run();
+}
+
 void TestMetricsServiceClient::CollectFinalMetrics(
     const base::Closure& done_callback) {
   done_callback.Run();
 }
 
 }  // namespace metrics