Reland the CL to remove candidates when doing continual gathering

webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java

Index: webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java
diff --git a/webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java b/webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java
index 195446ab5faf5c12f891de5178b91cc386e3027b..f9cb67bd02a01ad25e7b743cec910c3cc96239eb 100644
--- a/webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java
+++ b/webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCClient.java
@@ -59,6 +59,11 @@ public interface AppRTCClient {
   public void sendLocalIceCandidate(final IceCandidate candidate);
 
   /**
+   * Send removed ICE candidates to the other participant.
+   */
+  public void sendLocalIceCandidateRemovals(final IceCandidate[] candidates);
+
+  /**
    * Disconnect from room.
    */
   public void disconnectFromRoom();
@@ -113,6 +118,11 @@ public interface AppRTCClient {
     public void onRemoteIceCandidate(final IceCandidate candidate);
 
     /**
+     * Callback fired once remote Ice candidate removals are received.
+     */
+    public void onRemoteIceCandidatesRemoved(final IceCandidate[] candidates);
+
+    /**
      * Callback fired once channel is closed.
      */
     public void onChannelClose();