ash:Shelf - Added UMA stats for ShelfAlignment

ash/ash_periodic_metrics_recorder.h

Index: ash/ash_periodic_metrics_recorder.h
diff --git a/ash/ash_periodic_metrics_recorder.h b/ash/ash_periodic_metrics_recorder.h
new file mode 100644
index 0000000000000000000000000000000000000000..a68ec3f5aabd8df0ac19e1f656bcbc75e88537b5
--- /dev/null
+++ b/ash/ash_periodic_metrics_recorder.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2013 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.
+
+#ifndef ASH_ASH_PERIODIC_METRICS_RECORDER_H

[James Cook, 2013/11/01 00:28:51]

nit: end with trailing _

[Harry McCleave, 2013/11/01 01:00:38]

Done.

+#define ASH_ASH_PERIODIC_METRICS_RECORDER_H
+
+#include "base/timer/timer.h"
+
+namespace ash {
+
+class AshPeriodicMetricsRecorder {
+ public:
+  AshPeriodicMetricsRecorder();
+  ~AshPeriodicMetricsRecorder();
+
+ private:
+  void RecordMetrics();
+
+  base::RepeatingTimer<AshPeriodicMetricsRecorder> timer_;
+};
+
+}  // ash

[James Cook, 2013/11/01 00:28:51]

nit: "namespace ash"

[Harry McCleave, 2013/11/01 01:00:38]

Done.

+
+#endif  // ASH_ASH_PERIODIC_METRICS_RECORDER_H