Read attachments from the draft conversation.

Fixes b/6236948 Draft messages drop attachments.

Change-Id: Ic8da50fa81de699a076a193e3097c9946113812c
diff --git a/src/com/android/mail/providers/Message.java b/src/com/android/mail/providers/Message.java
index e6838be..2ae5e34 100644
--- a/src/com/android/mail/providers/Message.java
+++ b/src/com/android/mail/providers/Message.java
@@ -124,6 +124,7 @@
         dest.writeString(sendUri);
         dest.writeInt(alwaysShowImages ? 1 : 0);
         dest.writeInt(quotedTextOffset);
+        dest.writeString(attachmentsJson);
     }
 
     private Message(Parcel in) {
@@ -153,6 +154,7 @@
         sendUri = in.readString();
         alwaysShowImages = in.readInt() != 0;
         quotedTextOffset = in.readInt();
+        attachmentsJson = in.readString();
     }
 
     public Message() {