RTCRtpSender with track behind RuntimeEnabled flag

content/renderer/media/webrtc/rtc_rtp_sender.cc

Index: content/renderer/media/webrtc/rtc_rtp_sender.cc
diff --git a/content/renderer/media/webrtc/rtc_rtp_sender.cc b/content/renderer/media/webrtc/rtc_rtp_sender.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2d61389b39d2a4c00c9739471dbfdd884682f0b3
--- /dev/null
+++ b/content/renderer/media/webrtc/rtc_rtp_sender.cc
@@ -0,0 +1,52 @@
+// Copyright (c) 2017 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 "content/renderer/media/webrtc/rtc_rtp_sender.h"
+
+#include "base/logging.h"
+#include "third_party/webrtc/base/scoped_ref_ptr.h"
+
+namespace content {
+
+namespace {
+
+inline bool operator==(
+    const std::unique_ptr<blink::WebMediaStreamTrack>& web_track,
+    const webrtc::MediaStreamTrackInterface* webrtc_track) {
+  if (!web_track)
+    return !webrtc_track;
+  return webrtc_track && web_track->Id() == webrtc_track->id().c_str();
+}
+
+}  // namespace
+
+uintptr_t RTCRtpSender::getId(
+    const webrtc::RtpSenderInterface* webrtc_rtp_sender) {
+  return reinterpret_cast<uintptr_t>(webrtc_rtp_sender);
+}
+
+RTCRtpSender::RTCRtpSender(
+    webrtc::RtpSenderInterface* webrtc_rtp_sender,
+    std::unique_ptr<blink::WebMediaStreamTrack> web_track)
+    : webrtc_rtp_sender_(webrtc_rtp_sender), web_track_(std::move(web_track)) {
+  DCHECK(webrtc_rtp_sender_);
+  DCHECK(web_track_ == webrtc_track());
+}
+
+RTCRtpSender::~RTCRtpSender() {}
+
+uintptr_t RTCRtpSender::Id() const {
+  return getId(webrtc_rtp_sender_.get());
+}
+
+const blink::WebMediaStreamTrack* RTCRtpSender::Track() const {
+  DCHECK(web_track_ == webrtc_track());
+  return web_track_.get();
+}
+
+const webrtc::MediaStreamTrackInterface* RTCRtpSender::webrtc_track() const {
+  return webrtc_rtp_sender_->track();
+}
+
+}  // namespace content