tree ed6f8fdd6c43720e7243d61013498f7b84a9cc1f
parent 4204bd8d8415c06a8b659bcf83de3042cc4e11ca
author Natalie Weizenbaum <nweiz@google.com> 1441072900 -0700
committer Natalie Weizenbaum <nweiz@google.com> 1441072900 -0700

Share a body across all versions of a message.

This means that when one message is read, all other messages that were
created from the same original via `change()` will be marked read as
well.

Closes #49

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1327453002 .