One notable thing that I intentionally did was name
the event coming from the dropdown more simply. This
makes it easier to add a handler within the html like
`on-send` instead of `on-gr-reply-dropdown-send`.
After a bit of thought I think we should simplify all
event names for this purpose.
Feature: Issue 3649
Change-Id: I2460db54b5d85243988c22f572c00043c5597210
f8b026d227