[ozone/wayland] Convert WaylandCursorPosition to operate in DIP

... 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}

ui/ozone/platform/wayland/host/wayland_window.cc

@@ -305,6 +305,7 @@ uint32_t WaylandWindow::DispatchEvent(const PlatformEvent& native_event) {
 
     // Wayland sends locations in DIP so they need to be translated to
     // physical pixels.
+    UpdateCursorPositionFromEvent(Event::Clone(*event));
     event->AsLocatedEvent()->set_location_f(gfx::ScalePoint(
         event->AsLocatedEvent()->location_f(), buffer_scale(), buffer_scale()));
 
@@ -500,10 +501,6 @@ bool WaylandWindow::IsActive() const {
 
 uint32_t WaylandWindow::DispatchEventToDelegate(
     const PlatformEvent& native_event) {
-  auto* event = static_cast<Event*>(native_event);
-  if (event->IsLocatedEvent())
-    UpdateCursorPositionFromEvent(Event::Clone(*event));
-
   bool handled = DispatchEventFromNativeUiEvent(
       native_event, base::BindOnce(&PlatformWindowDelegate::DispatchEvent,
                                    base::Unretained(delegate_)));