Gerrit.Nav.setup() now takes a weblinks generator function as a third
parameter. Here's the function signature:
``` js
Gerrit.Nav.setup(navigate, generateUrl, generateWeblinks)
```
Weblinks generator function takes single payload parameter with
`type` property that determines which part of the UI is the consumer of
the weblinks. `type` property can be one of `file`, `change`, or
`patchset`.
For `file` type, payload will also contain string properties:
`repo`, `commit`, `file`.
For `pachset` type, payload will also contain string properties:
`repo`, `commit`.
For `change` type, payload will also contain string properties:
`repo`, `commit`.
If server provides weblinks, those will be passed as `options.weblinks`
property on the main payload object.
Change-Id: I0d9de3a295435304e2b6aad551112440075cf098
a28dee069f