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... instead of pixels.

It happens today that WaylandCursorPosition stores the last mouse
position in pixels, instead of DIP.

In lacros, this position is queried by the call to
`display::Screen::GetScreen()->GetCursorScreenPoint()` in
`ImmersiveFullscreenController::UpdateLocatedEventRevealedLock()`,
for instance by hovering the mouse cursor over the upper display
boundary in immersive fullscreen mode, so that the tabstrip slides
down.
When a high DPI display is used, the mismatch occurs.

This CL changes WaylandCursorPosition to store the last mouse cursor
position in DIP, instead of pixels.

BUG=1153998, 1113900
R=msisov@igalia.com

Change-Id: Id37ee61de4d22b8ffd190b403df91fd87e198007
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569775Reviewed-by: Maksim Sisov (GMT+2) <msisov@igalia.com>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#833294}