Add support for blocked chat events.

app/src/main/java/org/thoughtcrime/securesms/mms/OutgoingMessage.kt

@@ -55,6 +55,8 @@ data class OutgoingMessage(
   val messageToEdit: Long = 0,
   val isReportSpam: Boolean = false,
   val isMessageRequestAccept: Boolean = false,
+  val isBlocked: Boolean = false,
+  val isUnblocked: Boolean = false,
   val messageExtras: MessageExtras? = null
 ) {
 
@@ -435,6 +437,38 @@ data class OutgoingMessage(
       )
     }
 
+    /**
+     * Message for when you block someone
+     */
+    @JvmStatic
+    fun blockedMessage(threadRecipient: Recipient, sentTimeMillis: Long, expiresIn: Long): OutgoingMessage {
+      return OutgoingMessage(
+        threadRecipient = threadRecipient,
+        sentTimeMillis = sentTimeMillis,
+        expiresIn = expiresIn,
+        isGroup = threadRecipient.isPushV2Group,
+        isBlocked = true,
+        isUrgent = false,
+        isSecure = true
+      )
+    }
+
+    /**
+     * Message for when you unblock someone
+     */
+    @JvmStatic
+    fun unblockedMessage(threadRecipient: Recipient, sentTimeMillis: Long, expiresIn: Long): OutgoingMessage {
+      return OutgoingMessage(
+        threadRecipient = threadRecipient,
+        sentTimeMillis = sentTimeMillis,
+        expiresIn = expiresIn,
+        isGroup = threadRecipient.isPushV2Group,
+        isUnblocked = true,
+        isUrgent = false,
+        isSecure = true
+      )
+    }
+
     @JvmStatic
     fun buildMessage(slideDeck: SlideDeck, message: String): String {
       return if (message.isNotEmpty() && slideDeck.body.isNotEmpty()) {