Beta support for webrtc video and voice calling

// FREEBIE

src/org/thoughtcrime/securesms/events/WebRtcCallEvent.java

@@ -0,0 +1,52 @@
+package org.thoughtcrime.securesms.events;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import org.thoughtcrime.securesms.recipients.Recipient;
+
+public class WebRtcCallEvent {
+
+  public enum Type {
+    CALL_CONNECTED,
+    WAITING_FOR_RESPONDER,
+    SERVER_FAILURE,
+    PERFORMING_HANDSHAKE,
+    HANDSHAKE_FAILED,
+    CONNECTING_TO_INITIATOR,
+    CALL_DISCONNECTED,
+    CALL_RINGING,
+    RECIPIENT_UNAVAILABLE,
+    INCOMING_CALL,
+    OUTGOING_CALL,
+    CALL_BUSY,
+    LOGIN_FAILED,
+    DEBUG_INFO,
+    NO_SUCH_USER,
+    REMOTE_VIDEO_ENABLED,
+    REMOTE_VIDEO_DISABLED,
+    UNTRUSTED_IDENTITY
+  }
+
+  private final @NonNull  Type      type;
+  private final @NonNull  Recipient recipient;
+  private final @Nullable Object    extra;
+
+  public WebRtcCallEvent(@NonNull Type type, @NonNull Recipient recipient, @Nullable Object extra) {
+    this.type      = type;
+    this.recipient = recipient;
+    this.extra     = extra;
+  }
+
+  public @NonNull Type getType() {
+    return type;
+  }
+
+  public @NonNull Recipient getRecipient() {
+    return recipient;
+  }
+
+  public @Nullable Object getExtra() {
+    return extra;
+  }
+}