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 8f40a55f92435a86be0df1f818800b722d6a5a8e..fdf9cef51ec2a2a8b419227522d085a36b2c4ad2 100644
--- a/webrtc/api/peerconnectioninterface.h
+++ b/webrtc/api/peerconnectioninterface.h
@@ -149,6 +149,19 @@
     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 {
@@ -474,6 +487,10 @@
   // 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() = 0;
   virtual IceConnectionState ice_connection_state() = 0;
   virtual IceGatheringState ice_gathering_state() = 0;