Implement JNI and objc implementation for icecandidateerror event

This CL adds the callback on ICE Candidate Error to the Android and
the iOS SDKs.

Spec: https://www.w3.org/TR/webrtc/#dom-rtcpeerconnection-onicecandidateerror

Bug: webrtc:13446
Change-Id: I6e511aaa80f1aa8f4310d8518d1144d97470cd7e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/239460
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35531}
diff --git a/sdk/android/BUILD.gn b/sdk/android/BUILD.gn
index 20bee2b..1532acf 100644
--- a/sdk/android/BUILD.gn
+++ b/sdk/android/BUILD.gn
@@ -263,6 +263,7 @@
       "api/org/webrtc/FrameDecryptor.java",
       "api/org/webrtc/FrameEncryptor.java",
       "api/org/webrtc/IceCandidate.java",
+      "api/org/webrtc/IceCandidateErrorEvent.java",
       "api/org/webrtc/MediaConstraints.java",
       "api/org/webrtc/MediaSource.java",
       "api/org/webrtc/MediaStream.java",
@@ -1330,6 +1331,7 @@
       "api/org/webrtc/DataChannel.java",
       "api/org/webrtc/DtmfSender.java",
       "api/org/webrtc/IceCandidate.java",
+      "api/org/webrtc/IceCandidateErrorEvent.java",
       "api/org/webrtc/MediaConstraints.java",
       "api/org/webrtc/MediaSource.java",
       "api/org/webrtc/MediaStream.java",
diff --git a/sdk/android/api/org/webrtc/IceCandidateErrorEvent.java b/sdk/android/api/org/webrtc/IceCandidateErrorEvent.java
new file mode 100644
index 0000000..aae9da7
--- /dev/null
+++ b/sdk/android/api/org/webrtc/IceCandidateErrorEvent.java
@@ -0,0 +1,43 @@
+/*
+ *  Copyright (c) 2021 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.
+ */
+
+package org.webrtc;
+
+public final class IceCandidateErrorEvent {
+  /** The local IP address used to communicate with the STUN or TURN server. */
+  public final String address;
+  /** The port used to communicate with the STUN or TURN server. */
+  public final int port;
+  /**
+   * The STUN or TURN URL that identifies the STUN or TURN server for which the failure occurred.
+   */
+  public final String url;
+  /**
+   * The numeric STUN error code returned by the STUN or TURN server. If no host candidate can reach
+   * the server, errorCode will be set to the value 701 which is outside the STUN error code range.
+   * This error is only fired once per server URL while in the RTCIceGatheringState of "gathering".
+   */
+  public final int errorCode;
+  /**
+   * The STUN reason text returned by the STUN or TURN server. If the server could not be reached,
+   * errorText will be set to an implementation-specific value providing details about the error.
+   */
+  public final String errorText;
+
+  @CalledByNative
+  public IceCandidateErrorEvent(
+      String address, int port, String url, int errorCode, String errorText) {
+    this.address = address;
+    this.port = port;
+    this.url = url;
+    this.errorCode = errorCode;
+    this.errorText = errorText;
+  }
+}
diff --git a/sdk/android/api/org/webrtc/PeerConnection.java b/sdk/android/api/org/webrtc/PeerConnection.java
index 7ad72c4..468413b 100644
--- a/sdk/android/api/org/webrtc/PeerConnection.java
+++ b/sdk/android/api/org/webrtc/PeerConnection.java
@@ -118,6 +118,9 @@
     /** Triggered when a new ICE candidate has been found. */
     @CalledByNative("Observer") void onIceCandidate(IceCandidate candidate);
 
+    /** Triggered when gathering of an ICE candidate failed. */
+    default @CalledByNative("Observer") void onIceCandidateError(IceCandidateErrorEvent event) {}
+
     /** Triggered when some ICE candidates have been removed. */
     @CalledByNative("Observer") void onIceCandidatesRemoved(IceCandidate[] candidates);
 
diff --git a/sdk/android/instrumentationtests/src/org/webrtc/PeerConnectionEndToEndTest.java b/sdk/android/instrumentationtests/src/org/webrtc/PeerConnectionEndToEndTest.java
index 1281cbe..d9799ab 100644
--- a/sdk/android/instrumentationtests/src/org/webrtc/PeerConnectionEndToEndTest.java
+++ b/sdk/android/instrumentationtests/src/org/webrtc/PeerConnectionEndToEndTest.java
@@ -126,6 +126,9 @@
     }
 
     @Override
+    public void onIceCandidateError(IceCandidateErrorEvent event) {}
+
+    @Override
     public void onIceCandidatesRemoved(IceCandidate[] candidates) {}
 
     @Override
diff --git a/sdk/android/src/jni/pc/peer_connection.cc b/sdk/android/src/jni/pc/peer_connection.cc
index 9c73b94..143ad2b 100644
--- a/sdk/android/src/jni/pc/peer_connection.cc
+++ b/sdk/android/src/jni/pc/peer_connection.cc
@@ -41,6 +41,7 @@
 #include "rtc_base/logging.h"
 #include "rtc_base/numerics/safe_conversions.h"
 #include "sdk/android/generated_peerconnection_jni/CandidatePairChangeEvent_jni.h"
+#include "sdk/android/generated_peerconnection_jni/IceCandidateErrorEvent_jni.h"
 #include "sdk/android/generated_peerconnection_jni/PeerConnection_jni.h"
 #include "sdk/android/native_api/jni/java_types.h"
 #include "sdk/android/src/jni/jni_helpers.h"
@@ -306,6 +307,19 @@
                                NativeToJavaIceCandidate(env, *candidate));
 }
 
+void PeerConnectionObserverJni::OnIceCandidateError(
+    const std::string& address,
+    int port,
+    const std::string& url,
+    int error_code,
+    const std::string& error_text) {
+  JNIEnv* env = AttachCurrentThreadIfNeeded();
+  ScopedJavaLocalRef<jobject> event = Java_IceCandidateErrorEvent_Constructor(
+      env, NativeToJavaString(env, address), port, NativeToJavaString(env, url),
+      error_code, NativeToJavaString(env, error_text));
+  Java_Observer_onIceCandidateError(env, j_observer_global_, event);
+}
+
 void PeerConnectionObserverJni::OnIceCandidatesRemoved(
     const std::vector<cricket::Candidate>& candidates) {
   JNIEnv* env = AttachCurrentThreadIfNeeded();
diff --git a/sdk/android/src/jni/pc/peer_connection.h b/sdk/android/src/jni/pc/peer_connection.h
index 86d99f3..9976e8e 100644
--- a/sdk/android/src/jni/pc/peer_connection.h
+++ b/sdk/android/src/jni/pc/peer_connection.h
@@ -48,6 +48,12 @@
   // Implementation of PeerConnectionObserver interface, which propagates
   // the callbacks to the Java observer.
   void OnIceCandidate(const IceCandidateInterface* candidate) override;
+  void OnIceCandidateError(const std::string& address,
+                           int port,
+                           const std::string& url,
+                           int error_code,
+                           const std::string& error_text) override;
+
   void OnIceCandidatesRemoved(
       const std::vector<cricket::Candidate>& candidates) override;
   void OnSignalingChange(