Create and integrate a metrics service client into Blimp engine.

blimp/engine/app/blimp_metrics_service_client.h

Index: blimp/engine/app/blimp_metrics_service_client.h
diff --git a/blimp/engine/app/blimp_metrics_service_client.h b/blimp/engine/app/blimp_metrics_service_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..11f6afa3787b63c1f3591444170b53a06510d509
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+++ b/blimp/engine/app/blimp_metrics_service_client.h
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+// Copyright 2016 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 BLIMP_ENGINE_APP_BLIMP_METRICS_SERVICE_CLIENT_H_
+#define BLIMP_ENGINE_APP_BLIMP_METRICS_SERVICE_CLIENT_H_
+
+#include <stdint.h>
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+
+class PrefService;
+
+namespace net {
+class URLRequestContextGetter;
+}  // namespace net
+
+namespace blimp {
+namespace engine {
+
+// Initializes metrics reporting for Blimp including initializing metrics
+// providers and reporting state.
+void InitializeBlimpMetrics(
+    std::unique_ptr<PrefService> pref_service,
+    scoped_refptr<net::URLRequestContextGetter> request_context_getter);
+
+// Graceful and expected metrics reporting shutdown for Blimp.
+void FinalizeBlimpMetrics();
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_APP_BLIMP_METRICS_SERVICE_CLIENT_H_