Fix tab drag and drop with hi-dpi.

ui/views/widget/desktop_aura/x11_topmost_window_finder.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_TOPMOST_WINDOW_FINDER_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_TOPMOST_WINDOW_FINDER_H_
 
 #include <set>
 
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/views/views_export.h"
 
 namespace aura {
 class Window;
 }
 
 namespace views {
 
 // Utility class for finding the topmost window at a given screen position.
 class VIEWS_EXPORT X11TopmostWindowFinder
     : public ui::EnumerateWindowsDelegate {
  public:
   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:
   bool ShouldStopIterating(XID xid) override;
 
   // Returns true if |window| does not not belong to |ignore|, is visible and
   // contains |screen_loc_|.
   bool ShouldStopIteratingAtLocalProcessWindow(aura::Window* window);
 
   gfx::Point screen_loc_;

[sadrul, 2015/03/20 22:02:03]

Add _in_pixels_ here too

[stapelberg, 2015/03/20 23:17:05]

Done.

   std::set<aura::Window*> ignore_;
   XID toplevel_;
 
   DISALLOW_COPY_AND_ASSIGN(X11TopmostWindowFinder);
 };
 
 }  // namespace
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_TOPMOST_WINDOW_FINDER_H_