[automerger skipped] Merge "Add OverviewScreenshotActions plugin interface and use it in TaskView." into ub-launcher3-qt-future-dev
am: 5ba1fc93c4 -s ours
am skip reason: change_id Idbefc11ef32619dd5eaaa5552088859eb2304e1e with SHA1 90c303b6a7 is in history

Change-Id: I12069297b26c3b5d614ee8986aab38225429d94e