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This is a reland of 7138b785

WaylandPopup didn't allow empty bounds. Fixed by
https://crrev.com/c/2397695

Original change's description:
> ozone/wayland: Fix drop down menus for touch events.
>
> In case of touch events, we may not find currently focused windows
> as menu windows might be created on touch up events. Thus,
> GetCurrentFocusedWindow returns nullptr.
>
> To fix that, use a concept of a currently active window. That is,
> Wayland sets a window to "active" state if it has had a focus.
> There can be only one focused window at a time.
>
> Thus, if there is no a focused window, use currently active window
> as a parent. That's the best effort one could make to find a parent
> window for a newly created non-toplevel window. At some point,
> it might be worth reconsidering the design and make aura always pass
> parent widgets for new windows if applicable.
>
> Bug: 1123521
> Change-Id: Ib9479632e049df082ed17e3089680006a32f19fc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2385279
> Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
> Reviewed-by: Nick Yamane <nickdiego@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#804674}

Bug: 1123521
Change-Id: I62c6b254bc2e931bc93ac4609290518138aa19b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397715
Commit-Queue: Antonio Gomes (GMT-4) <tonikitoo@igalia.com>
Auto-Submit: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Antonio Gomes (GMT-4) <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#804914}