chromium/third_party/blink/renderer/platform/mediastream/webrtc_uma_histograms.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_WEBRTC_UMA_HISTOGRAMS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_WEBRTC_UMA_HISTOGRAMS_H_

#include "base/memory/singleton.h"
#include "base/threading/thread_checker.h"
#include "third_party/blink/public/common/mediastream/media_stream_request.h"
#include "third_party/blink/public/mojom/mediastream/media_stream.mojom-shared.h"
#include "third_party/blink/renderer/platform/peerconnection/rtc_api_name.h"
#include "third_party/blink/renderer/platform/platform_export.h"

namespace blink {

PLATFORM_EXPORT void LogUserMediaRequestResult(
    mojom::MediaStreamRequestResult result);

// Helper method used to collect information about the number of times
// different WebRTC APIs are called from JavaScript.
//
// This contributes to two histograms; the former is a raw count of
// the number of times the APIs are called, and be viewed at
// chrome://histograms/WebRTC.webkitApiCount.
//
// The latter is a count of the number of times the APIs are called
// that gets incremented only once per "session" as established by the
// PerSessionWebRTCAPIMetrics singleton below. It can be viewed at
// chrome://histograms/WebRTC.webkitApiCountPerSession.
PLATFORM_EXPORT void UpdateWebRTCMethodCount(RTCAPIName api_name);

// A singleton that keeps track of the number of MediaStreams being
// sent over PeerConnections. It uses the transition to zero such
// streams to demarcate the start of a new "session". Note that this
// is a rough approximation of sessions, as you could conceivably have
// multiple tabs using this renderer process, and each of them using
// PeerConnections.
//
// The UpdateWebRTCMethodCount function above uses this class to log a
// metric at most once per session.
class PLATFORM_EXPORT PerSessionWebRTCAPIMetrics { … };

}  //  namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_WEBRTC_UMA_HISTOGRAMS_H_