D23099: Allow sending a port message and receive a reply

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, davidedmundson, fvogt.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Instead of manually matching a sent message to a port message, allow adding a serial which is then used to relate a reply back so you just get a neat Promise-based API.
  For compatibility, the existing method cannot be changed, as with new extension and older host I will never get a reply, and I cannot tell whether the caller actually asked for the promise or not and if they didn't we would leak the promise resolvers as we never got a reply.

TEST PLAN
  Placed a `sendReply` call in a `handleData`
  
    sendPortMessageWithReply("settings", "getSubsystemStatus").then((message) => {
        console.log("got the status", message);
    });

REPOSITORY
  R856 Plasma Browser Integration

REVISION DETAIL
  https://phabricator.kde.org/D23099

AFFECTED FILES
  extension/extension-utils.js
  extension/extension.js
  host/abstractbrowserplugin.cpp
  host/abstractbrowserplugin.h
  host/pluginmanager.cpp

To: broulik, #plasma, davidedmundson, fvogt
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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