Fix tab drag and drop with hi-dpi.

ui/views/widget/desktop_aura/x11_topmost_window_finder.cc

Index: ui/views/widget/desktop_aura/x11_topmost_window_finder.cc
diff --git a/ui/views/widget/desktop_aura/x11_topmost_window_finder.cc b/ui/views/widget/desktop_aura/x11_topmost_window_finder.cc
index d59b46cf3798755f1bfc8a11995b0723e64cbc18..f4228e217976e0bdd41d94027def58a5a380214a 100644
--- a/ui/views/widget/desktop_aura/x11_topmost_window_finder.cc
+++ b/ui/views/widget/desktop_aura/x11_topmost_window_finder.cc
@@ -19,9 +19,9 @@ X11TopmostWindowFinder::~X11TopmostWindowFinder() {
 }
 
 aura::Window* X11TopmostWindowFinder::FindLocalProcessWindowAt(
-    const gfx::Point& screen_loc,
+    const gfx::Point& screen_loc_in_pixels,
     const std::set<aura::Window*>& ignore) {
-  screen_loc_ = screen_loc;
+  screen_loc_ = screen_loc_in_pixels;
   ignore_ = ignore;
 
   std::vector<aura::Window*> local_process_windows =
@@ -40,8 +40,9 @@ aura::Window* X11TopmostWindowFinder::FindLocalProcessWindowAt(
   return DesktopWindowTreeHostX11::GetContentWindowForXID(toplevel_);
 }
 
-XID X11TopmostWindowFinder::FindWindowAt(const gfx::Point& screen_loc) {
-  screen_loc_ = screen_loc;
+XID X11TopmostWindowFinder::FindWindowAt(
+    const gfx::Point& screen_loc_in_pixels) {
+  screen_loc_ = screen_loc_in_pixels;
   ui::EnumerateTopLevelWindows(this);
   return toplevel_;
 }