Fix b/6899989.

Now, we block any updates to MessageAttachmentBar's
buttons when the progress dialog is visible. Additionally,
we also block the first update after closing the progress
dialog to prevent a quick update that is then reverted
once the attachment data has been updated.

Change-Id: I4a5ba0720e257c6d9ef09f93a5ac7e7a6b8c6370
2 files changed