Adds CastMetricsServiceClient to Chromecast shell.

chromecast/metrics/platform_metrics_providers_simple.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 "chromecast/metrics/platform_metrics_providers.h"
+
+namespace chromecast {
+namespace metrics {
+
+void RegisterPlatformMetricsProviders(MetricsService* metrics_service) {
+}
+
+::metrics::SystemProfileProto::Channel GetPlatformReleaseChannel() {
+  return ::metrics::SystemProfileProto::CHANNEL_STABLE;
+}
+
+std::string GetPlatformVersionString() {
+  return "";
+}
+
+bool PlatformIsReportingEnabled() {
+  return false;
+}
+
+void PlatformSetClientID(const std::string& client_id) {
+}
+
+void PlatformOnLogUploadComplete() {
+}
+
+}  // namespace metrics
+}  // namespace chromecast