api/test: Add Create() method to MockPeerConnectionInterface

Bug: webrtc:9620
Change-Id: Id389e433cceed6435f6d07c1eae70c2d582c617f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226323
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34491}
diff --git a/api/test/mock_peerconnectioninterface.h b/api/test/mock_peerconnectioninterface.h
index b5d9423..cd67d32 100644
--- a/api/test/mock_peerconnectioninterface.h
+++ b/api/test/mock_peerconnectioninterface.h
@@ -18,7 +18,9 @@
 #include <vector>
 
 #include "api/peer_connection_interface.h"
+#include "api/scoped_refptr.h"
 #include "api/sctp_transport_interface.h"
+#include "rtc_base/ref_counted_object.h"
 #include "test/gmock.h"
 
 namespace webrtc {
@@ -26,6 +28,10 @@
 class MockPeerConnectionInterface
     : public rtc::RefCountedObject<webrtc::PeerConnectionInterface> {
  public:
+  static rtc::scoped_refptr<MockPeerConnectionInterface> Create() {
+    return new MockPeerConnectionInterface();
+  }
+
   // PeerConnectionInterface
   MOCK_METHOD(rtc::scoped_refptr<StreamCollectionInterface>,
               local_streams,