ozone/wayland: DnD located events must be in px.

Wayland sends all the events in dip, but Chromium expects them
to be in px. Ozone/Wayland has already been translating located
events in px except the dnd located events.

This CL fixes that issue.

Bug: 1044936
Change-Id: I233950227fa641ebc88b7438e3d2ce3f1dc5de60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014929Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#735228}

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

@@ -249,7 +249,12 @@ void WaylandSurface::OnDragEnter(const gfx::PointF& point,
   WmDropHandler* drop_handler = GetWmDropHandler(*this);
   if (!drop_handler)
     return;
-  drop_handler->OnDragEnter(point, std::move(data), operation);
+
+  // Wayland sends locations in DIP so they need to be translated to
+  // physical pixels.
+  drop_handler->OnDragEnter(
+      gfx::ScalePoint(point, buffer_scale(), buffer_scale()), std::move(data),
+      operation);
 }
 
 int WaylandSurface::OnDragMotion(const gfx::PointF& point,
@@ -259,7 +264,10 @@ int WaylandSurface::OnDragMotion(const gfx::PointF& point,
   if (!drop_handler)
     return 0;
 
-  return drop_handler->OnDragMotion(point, operation);
+  // Wayland sends locations in DIP so they need to be translated to
+  // physical pixels.
+  return drop_handler->OnDragMotion(
+      gfx::ScalePoint(point, buffer_scale(), buffer_scale()), operation);
 }
 
 void WaylandSurface::OnDragDrop(std::unique_ptr<OSExchangeData> data) {