Refactor save dialog setup so logic for canPreview/canReview
is external and passed in.
'Show preview' will show in the VE command help dialog until
I56c1036e6 is merged in core.
Bug: T149914
Change-Id: Id718ad622be43c03df61d12b8688d53462c59f36
Create a new MWSaveDialogAction, which can be hooked up to triggers. Switch
the existing save dialog accesskey to just use the trigger system.
(Maintaining all the accesskey logic, so we don't change the shortcut on
people.)
Bug: T149914
Change-Id: I9b4ef8504148703556f802b266a517dd5098c06b