Chromecast: adds class to help record complex histograms.

chromecast/base/metrics/cast_metrics_test_helper.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/base/metrics/cast_metrics_test_helper.h"
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "chromecast/base/metrics/cast_metrics_helper.h"
+
+namespace chromecast {
+namespace metrics {
+
+namespace {
+
+class CastMetricsHelperStub : public CastMetricsHelper {
+ public:
+  CastMetricsHelperStub();
+  virtual ~CastMetricsHelperStub();
+
+  virtual void TagAppStart(const std::string& arg_app_name) override;
+  virtual void LogMediaPlay() override;
+  virtual void LogMediaPause() override;
+  virtual void LogTimeToDisplayVideo() override;
+  virtual void LogTimeToBufferAv(BufferingType buffering_type,
+                                 base::TimeDelta time) override;
+  virtual void ResetVideoFrameSampling() override;
+  virtual void LogFramesPer5Seconds(
+      int displayed_frames, int dropped_frames,
+      int delayed_frames, int error_frames) override;
+  virtual std::string GetMetricsNameWithAppName(
+      const std::string& prefix, const std::string& suffix) const override;
+  virtual void SetMetricsSink(MetricsSink* delegate) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CastMetricsHelperStub);
+};
+
+bool stub_instance_exists = false;
+
+CastMetricsHelperStub::CastMetricsHelperStub()
+    : CastMetricsHelper() {
+  DCHECK(!stub_instance_exists);
+  stub_instance_exists = true;
+}
+
+CastMetricsHelperStub::~CastMetricsHelperStub() {
+  DCHECK(stub_instance_exists);
+  stub_instance_exists = false;
+}
+
+void CastMetricsHelperStub::TagAppStart(const std::string& arg_app_name) {
+}
+
+void CastMetricsHelperStub::LogMediaPlay() {
+}
+
+void CastMetricsHelperStub::LogMediaPause() {
+}
+
+void CastMetricsHelperStub::LogTimeToDisplayVideo() {
+}
+
+void CastMetricsHelperStub::LogTimeToBufferAv(BufferingType buffering_type,
+                                              base::TimeDelta time) {
+}
+
+void CastMetricsHelperStub::ResetVideoFrameSampling() {
+}
+
+void CastMetricsHelperStub::LogFramesPer5Seconds(int displayed_frames,
+                                                 int dropped_frames,
+                                                 int delayed_frames,
+                                                 int error_frames) {
+}
+
+std::string CastMetricsHelperStub::GetMetricsNameWithAppName(
+    const std::string& prefix,
+    const std::string& suffix) const {
+  return "";
+}
+
+void CastMetricsHelperStub::SetMetricsSink(MetricsSink* delegate) {
+}
+
+}  // namespace
+
+void InitializeMetricsHelperForTesting() {
+  if (!stub_instance_exists) {
+    new CastMetricsHelperStub();
+  }
+}
+
+}  // namespace metrics
+}  // namespace chromecast