Still waiting for a few missing assets, but it's done other than that.
The divider change is already merged; new layouts all use the framework style.
It's basically all layout changes, except for:
- Now the recepient address line has "Show details", which shows a dialog with
all to/cc/bcc addresses with the timestamp.
- Now invite response buttons are checkboxes.
(But the basic behavior doesn't change -- once you check a response,
the message will be gone, so you can't change the response later.)
Copied message_header_bg from gmail manuall. It'll look silly without it.
Bug 3138021
Bug 3307021
Change-Id: I6f7eb91d6104c3143a5c58b0c4c6c19929cea477
