Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/api/stats/rtcstatscollectorcallback.h

+/*
+ *  Copyright 2016 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 WEBRTC_API_STATS_RTCSTATSCOLLECTORCALLBACK_H_
+#define WEBRTC_API_STATS_RTCSTATSCOLLECTORCALLBACK_H_
+
+#include "webrtc/api/stats/rtcstatsreport.h"
+#include "webrtc/base/refcount.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+
+namespace webrtc {
+
+class RTCStatsCollectorCallback : public virtual rtc::RefCountInterface {
+ public:
+  virtual ~RTCStatsCollectorCallback() {}
+
+  virtual void OnStatsDelivered(
+      const rtc::scoped_refptr<const RTCStatsReport>& report) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_STATS_RTCSTATSCOLLECTORCALLBACK_H_