RTCRtpReceiver.getContributingSources() added.

third_party/WebKit/Source/modules/peerconnection/RTCRtpContributingSource.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCRtpContributingSource.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCRtpContributingSource.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCRtpContributingSource.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..526933135b5a78512ed856fc2bb60300c65c19fe
--- /dev/null
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCRtpContributingSource.cpp
@@ -0,0 +1,41 @@
+// Copyright 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 "modules/peerconnection/RTCRtpContributingSource.h"
+
+#include "modules/peerconnection/RTCRtpReceiver.h"
+#include "public/platform/WebRTCRtpContributingSource.h"
+
+namespace blink {
+
+RTCRtpContributingSource::RTCRtpContributingSource(
+    RTCRtpReceiver* receiver,
+    const WebRTCRtpContributingSource& webContributingSource)
+    : m_receiver(receiver),
+      m_timestampMs(webContributingSource.timestampMs()),
+      m_source(webContributingSource.source()) {
+  DCHECK(m_receiver);
+}
+
+void RTCRtpContributingSource::updateMembers(
+    const WebRTCRtpContributingSource& webContributingSource) {
+  m_timestampMs = webContributingSource.timestampMs();
+  DCHECK_EQ(webContributingSource.source(), m_source);
+}
+
+double RTCRtpContributingSource::timestamp() {
+  m_receiver->updateSourcesIfNeeded();
+  return m_timestampMs;
+}
+
+uint32_t RTCRtpContributingSource::source() const {
+  // Skip |m_receiver->updateSourcesIfNeeded()|, |m_source| is a constant.
+  return m_source;
+}
+
+DEFINE_TRACE(RTCRtpContributingSource) {
+  visitor->trace(m_receiver);
+}
+
+}  // namespace blink