Fix tab drag and drop with hi-dpi.

ui/views/widget/desktop_aura/x11_topmost_window_finder.h

Index: ui/views/widget/desktop_aura/x11_topmost_window_finder.h
diff --git a/ui/views/widget/desktop_aura/x11_topmost_window_finder.h b/ui/views/widget/desktop_aura/x11_topmost_window_finder.h
index 4f26efc3048a56bfc5d4d944511aab54161ae47d..5e3567a75283df63acd21ddfd4c70f2aa6f40e4e 100644
--- a/ui/views/widget/desktop_aura/x11_topmost_window_finder.h
+++ b/ui/views/widget/desktop_aura/x11_topmost_window_finder.h
@@ -24,14 +24,14 @@ class VIEWS_EXPORT X11TopmostWindowFinder
   X11TopmostWindowFinder();
   ~X11TopmostWindowFinder() override;
 
-  // Returns the topmost window at |screen_loc|, ignoring the windows in
-  // |ignore|. Returns NULL if the topmost window at |screen_loc| does not
-  // belong to Chrome.
-  aura::Window* FindLocalProcessWindowAt(const gfx::Point& screen_loc,
+  // Returns the topmost window at |screen_loc_in_pixels|, ignoring the windows
+  // in |ignore|. Returns NULL if the topmost window at |screen_loc_in_pixels|
+  // does not belong to Chrome.
+  aura::Window* FindLocalProcessWindowAt(const gfx::Point& screen_loc_in_pixels,
                                          const std::set<aura::Window*>& ignore);
 
-  // Returns the topmost window at |screen_loc|.
-  XID FindWindowAt(const gfx::Point& screen_loc);
+  // Returns the topmost window at |screen_loc_in_pixels|.
+  XID FindWindowAt(const gfx::Point& screen_loc_in_pixels);
 
  private:
   // ui::EnumerateWindowsDelegate:
@@ -41,7 +41,7 @@ class VIEWS_EXPORT X11TopmostWindowFinder
   // contains |screen_loc_|.
   bool ShouldStopIteratingAtLocalProcessWindow(aura::Window* window);
 
-  gfx::Point screen_loc_;
+  gfx::Point screen_loc_in_pixels_;
   std::set<aura::Window*> ignore_;
   XID toplevel_;