[wayland] Call ShellClient install interface methods consistently

Authored by davidedmundson on Jan 29 2019, 12:56 PM.



When we create a new Shellclient there may be a pending relevant

For every other case this is handled in WaylandServer, the class
responsible for attaching new interfaces at runtime.
The only exception is ServerSideDecorationInterface which is handled in
the ShellClient constructor.

This makes everything consistent.

No behavioural changes.

Test Plan

Ran unit tests

Diff Detail

R108 KWin
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.
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davidedmundson requested review of this revision.Jan 29 2019, 12:56 PM
zzag accepted this revision.Jan 29 2019, 1:27 PM
This revision is now accepted and ready to land.Jan 29 2019, 1:27 PM
This revision was automatically updated to reflect the committed changes.