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+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef TEST_TESTSUPPORT_PERF_TEST_H_
+#define TEST_TESTSUPPORT_PERF_TEST_H_
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/array_view.h"
+#include "api/numerics/samples_stats_counter.h"
+
+namespace webrtc {
+namespace test {
+
+enum class ImproveDirection {
+  // Direction is undefined.
+  kNone,
+  // Smaller value is better.
+  kSmallerIsBetter,
+  // Bigger value is better.
+  kBiggerIsBetter,
+};
+
+// Prints a performance test result.
+//
+// For example,
+// PrintResult("ramp_up_time_", "turn_over_tcp",
+//             "bwe_15s", 1234.2, "ms", false);
+//
+// will show up in the http://chromeperf.appspot.com under
+//
+// (test binary name) > (bot) > ramp_up_time_turn_over_tcp > bwe_15s.
+//
+// The `measurement` + `modifier` is what we're measuring. `user_story` is the
+// scenario we're testing under.
+//
+// The binary this runs in must be hooked up as a perf test in the WebRTC
+// recipes for this to actually be uploaded to chromeperf.appspot.com.
+void PrintResult(absl::string_view measurement,
+                 absl::string_view modifier,
+                 absl::string_view user_story,
+                 double value,
+                 absl::string_view units,
+                 bool important,
+                 ImproveDirection improve_direction = ImproveDirection::kNone);
+
+// Like PrintResult(), but prints a (mean, standard deviation) result pair.
+// The |<values>| should be two comma-separated numbers, the mean and
+// standard deviation (or other error metric) of the measurement.
+// DEPRECATED: soon unsupported.
+void PrintResultMeanAndError(
+    absl::string_view measurement,
+    absl::string_view modifier,
+    absl::string_view user_story,
+    double mean,
+    double error,
+    absl::string_view units,
+    bool important,
+    ImproveDirection improve_direction = ImproveDirection::kNone);
+
+// Like PrintResult(), but prints an entire list of results. The `values`
+// will generally be a list of comma-separated numbers. A typical
+// post-processing step might produce plots of their mean and standard
+// deviation.
+void PrintResultList(
+    absl::string_view measurement,
+    absl::string_view modifier,
+    absl::string_view user_story,
+    rtc::ArrayView<const double> values,
+    absl::string_view units,
+    bool important,
+    ImproveDirection improve_direction = ImproveDirection::kNone);
+
+// Like PrintResult(), but prints a (mean, standard deviation) from stats
+// counter. Also add specified metric to the plotable metrics output.
+void PrintResult(absl::string_view measurement,
+                 absl::string_view modifier,
+                 absl::string_view user_story,
+                 const SamplesStatsCounter& counter,
+                 absl::string_view units,
+                 bool important,
+                 ImproveDirection improve_direction = ImproveDirection::kNone);
+
+// Returns a string-encoded proto as described in
+// tracing/tracing/proto/histogram.proto in
+// https://github.com/catapult-project/catapult/blob/master/.
+// If you want to print the proto in human readable format, use
+// tracing/bin/proto2json from third_party/catapult in your WebRTC checkout.
+std::string GetPerfResults();
+
+// Print into stdout plottable metrics for further post processing.
+// `desired_graphs` - list of metrics, that should be plotted. If empty - all
+// available metrics will be plotted. If some of `desired_graphs` are missing
+// they will be skipped.
+void PrintPlottableResults(const std::vector<std::string>& desired_graphs);
+
+// Call GetPerfResults() and write its output to a file. Returns false if we
+// failed to write to the file. If you want to print the proto in human readable
+// format, use tracing/bin/proto2json from third_party/catapult in your WebRTC
+// checkout.
+bool WritePerfResults(const std::string& output_path);
+
+// By default, human-readable perf results are printed to stdout. Set the FILE*
+// to where they should be printing instead. These results are not used to
+// upload to the dashboard, however - this is only through WritePerfResults.
+void SetPerfResultsOutput(FILE* output);
+
+// Only for use by tests.
+void ClearPerfResults();
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TESTSUPPORT_PERF_TEST_H_