Adding error enum to be used by PeerConnectionInterface methods.

webrtc/api/peerconnection.cc

 /*
  *  Copyright 2012 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.
  */
 
@@ skipping 414 matching lines @@
       }
       static_cast<RECEIVER*>(receiver->internal())->SetChannel(channel);
     }
   }
 }
 
 }  // namespace
 
 namespace webrtc {
 
+static const char* const kRtcErrorNames[] = {
+    "NONE",
+    "UNSUPPORTED_PARAMETER",
+    "INVALID_PARAMETER",
+    "INVALID_RANGE",
+    "SYNTAX_ERROR",
+    "INVALID_STATE",
+    "INVALID_MODIFICATION",
+    "NETWORK_ERROR",
+    "INTERNAL_ERROR",
+};
+
+std::ostream& operator<<(std::ostream& stream, RtcError error) {
+  int index = static_cast<int>(error);
+  RTC_CHECK(index < static_cast<int>(sizeof(kRtcErrorNames) /
+                                     sizeof(kRtcErrorNames[0])));
+  return stream << kRtcErrorNames[index];
+}
+
 // Generate a RTCP CNAME when a PeerConnection is created.
 std::string GenerateRtcpCname() {
   std::string cname;
   if (!rtc::CreateRandomString(kRtcpCnameLength, &cname)) {
     LOG(LS_ERROR) << "Failed to generate CNAME.";
     RTC_DCHECK(false);
   }
   return cname;
 }
 
@@ skipping 1922 matching lines @@
 
 bool PeerConnection::StartRtcEventLog_w(rtc::PlatformFile file,
                                         int64_t max_size_bytes) {
   return event_log_->StartLogging(file, max_size_bytes);
 }
 
 void PeerConnection::StopRtcEventLog_w() {
   event_log_->StopLogging();
 }
 }  // namespace webrtc