Introduce MetricsServiceClient::StartGatheringMetrics

chrome/browser/metrics/chrome_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 "chrome/browser/metrics/chrome_metrics_service_client.h"
 
 #include "base/bind.h"
+#include "base/callback.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/metrics/metrics_service.h"
@@ skipping 257 matching lines @@
     case content::NOTIFICATION_RENDER_WIDGET_HOST_HANG:
       // TODO(isherman): Remove this NULL check: http://crbug.com/375248
       if (service_)
         service_->OnApplicationNotIdle();
       break;
 
     default:
       NOTREACHED();
   }
 }
+
+void ChromeMetricsServiceClient::StartGatheringMetrics(
+    const base::Closure& done_callback) {
+  // TODO(blundell): Move metrics gathering tasks from MetricsService to here.
+  done_callback.Run();
+}