Fixed tab dragging which was broken on high DPI windows for scales other than 100%.

ui/app_list/views/apps_grid_view.cc

 // 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.
 
 #include "ui/app_list/views/apps_grid_view.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 
@@ skipping 28 matching lines @@
 #endif  // defined(USE_AURA)
 
 #if defined(OS_WIN)
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/win/shortcut.h"
 #include "ui/base/dragdrop/drag_utils.h"
 #include "ui/base/dragdrop/drop_target_win.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_win.h"
+#include "ui/gfx/win/dpi.h"
 #endif
 
 namespace app_list {
 
 namespace {
 
 // Distance a drag needs to be from the app grid to be considered 'outside', at
 // which point we rearrange the apps to their pre-drag configuration, as a drop
 // then would be canceled. We have a buffer to make it easier to drag apps to
 // other pages.
@@ skipping 228 matching lines @@
     POINT p;
     GetCursorPos(&p);
     return GetGridViewHWND() == WindowFromPoint(p);
   }
 
   gfx::Point GetCursorInGridViewCoords() {
     POINT p;
     GetCursorPos(&p);
     ScreenToClient(GetGridViewHWND(), &p);
     gfx::Point grid_view_pt(p.x, p.y);
+    grid_view_pt = gfx::win::ScreenToDIPPoint(grid_view_pt);
     views::View::ConvertPointFromWidget(grid_view_, &grid_view_pt);
     return grid_view_pt;
   }
 
   AppsGridView* grid_view_;
   AppListItemView* drag_view_;
   gfx::Point drag_view_offset_;
   bool has_shortcut_path_;
   base::FilePath shortcut_path_;
   bool running_;
@@ skipping 1778 matching lines @@
 void AppsGridView::SetAsFolderDroppingTarget(const Index& target_index,
                                              bool is_target_folder) {
   AppListItemView* target_view =
       static_cast<AppListItemView*>(
           GetViewAtSlotOnCurrentPage(target_index.slot));
   if (target_view)
     target_view->SetAsAttemptedFolderTarget(is_target_folder);
 }
 
 }  // namespace app_list