Fix tab drag and drop with hi-dpi.

chrome/browser/ui/views/tabs/tab_drag_controller.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 426 matching lines @@
   // |point_in_screen|.
   gfx::Vector2d GetWindowOffset(const gfx::Point& point_in_screen);
 
   // Returns true if moving the mouse only changes the visible tabs.
   bool move_only() const {
     return (move_behavior_ == MOVE_VISIBILE_TABS) != 0;
   }
 
   // Returns the NativeWindow at the specified point. If |exclude_dragged_view|
   // is true, then the dragged view is not considered.
-  gfx::NativeWindow GetLocalProcessWindow(const gfx::Point& screen_point,
+  gfx::NativeWindow GetLocalProcessWindow(gfx::Point screen_point,

[sadrul, 2015/03/20 17:40:24]

Why this change?

[stapelberg, 2015/03/20 21:48:06]

It saved a conditional branch by overwriting the screen_point variable. But this
reverted now anyway :).

                                           bool exclude_dragged_view);
 
   // Handles registering for notifications.
   content::NotificationRegistrar registrar_;
 
   EventSource event_source_;
 
   // The TabStrip the drag originated from.
   TabStrip* source_tabstrip_;
 
@@ skipping 141 matching lines @@
   int attach_index_;
 
   scoped_ptr<ui::EventHandler> escape_tracker_;
 
   base::WeakPtrFactory<TabDragController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_