Adds PeerConnection scenario test framework.

Bug: webrtc:10839
Change-Id: If67eeb680d016d66c69d8e761a88c240e4931a5d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147276
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28754}

test/peer_scenario/sdp_callbacks.cc

@@ -0,0 +1,54 @@
+/*
+ *  Copyright (c) 2019 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.
+ */
+#include "test/peer_scenario/sdp_callbacks.h"
+
+#include <utility>
+
+namespace webrtc {
+namespace test {
+
+webrtc_sdp_obs_impl::SdpSetObserversInterface* SdpSetObserver(
+    std::function<void()> callback) {
+  class SdpSetObserver : public webrtc_sdp_obs_impl::SdpSetObserversInterface {
+   public:
+    explicit SdpSetObserver(std::function<void()> callback)
+        : callback_(std::move(callback)) {}
+    void OnSuccess() override { callback_(); }
+    void OnFailure(RTCError error) override {
+      RTC_NOTREACHED() << error.message();
+    }
+    void OnSetRemoteDescriptionComplete(RTCError error) override {
+      RTC_CHECK(error.ok()) << error.message();
+      callback_();
+    }
+    std::function<void()> callback_;
+  };
+  return new rtc::RefCountedObject<SdpSetObserver>(std::move(callback));
+}
+
+CreateSessionDescriptionObserver* SdpCreateObserver(
+    std::function<void(SessionDescriptionInterface*)> callback) {
+  class SdpCreateObserver : public CreateSessionDescriptionObserver {
+   public:
+    explicit SdpCreateObserver(decltype(callback) callback)
+        : callback_(std::move(callback)) {}
+    void OnSuccess(SessionDescriptionInterface* desc) override {
+      callback_(desc);
+    }
+    void OnFailure(RTCError error) override {
+      RTC_NOTREACHED() << error.message();
+    }
+    decltype(callback) callback_;
+  };
+  return new rtc::RefCountedObject<SdpCreateObserver>(std::move(callback));
+}
+
+}  // namespace test
+}  // namespace webrtc