Revert of "Remove the obsolete enum webrtc::PeerConnectionInterface::IceState."

webrtc/api/peerconnectioninterface.h

Index: webrtc/api/peerconnectioninterface.h
diff --git a/webrtc/api/peerconnectioninterface.h b/webrtc/api/peerconnectioninterface.h
index ea056bfc98fa2a39a1935a911988e3a1be35d897..a04e53e2ac935f54ed5bf0398de456285a99f106 100644
--- a/webrtc/api/peerconnectioninterface.h
+++ b/webrtc/api/peerconnectioninterface.h
@@ -150,6 +150,19 @@
     kHaveRemoteOffer,
     kHaveRemotePrAnswer,
     kClosed,
+  };
+
+  // TODO(bemasc): Remove IceState when callers are changed to
+  // IceConnection/GatheringState.
+  enum IceState {
+    kIceNew,
+    kIceGathering,
+    kIceWaiting,
+    kIceChecking,
+    kIceConnected,
+    kIceCompleted,
+    kIceFailed,
+    kIceClosed,
   };
 
   enum IceGatheringState {
@@ -509,6 +522,14 @@
 
   // Returns the current SignalingState.
   virtual SignalingState signaling_state() = 0;
+
+  // TODO(bemasc): Remove ice_state when callers are changed to
+  // IceConnection/GatheringState.
+  // Returns the current IceState.
+  virtual IceState ice_state() {
+      RTC_NOTREACHED();
+    return kIceNew;
+  }
   virtual IceConnectionState ice_connection_state() = 0;
   virtual IceGatheringState ice_gathering_state() = 0;