Fix the issue of cursor's device scale factor when using monitors with differnt device scale factor.

ash/wm/workspace/snap_sizer.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 "ash/wm/workspace/snap_sizer.h"
 
 #include <cmath>
 
 #include "ash/screen_ash.h"
 #include "ash/wm/window_resizer.h"
@@ skipping 82 matching lines @@
   gfx::Rect work_area(ScreenAsh::GetUnmaximizedWorkAreaBoundsInParent(window_));
   int y = work_area.y();
   // We don't align to the bottom of the grid as the launcher may not
   // necessarily align to the grid (happens when auto-hidden).
   int max_y = work_area.bottom();
   int width = kSizes[size_index];
   if (resize_disabled_) {
     width = std::max(1024, work_area.width() / 2);
   } else {
     while (width >= work_area.width()) {
+      ++size_index;
       if (size_index >= arraysize(kSizes))
         break;
-      width = kSizes[++size_index];
+      width = kSizes[size_index];
     }
   }
 
   // Make sure that we keep the size of the window smaller then a certain
   // fraction of the screen space.
   width = std::min(width, kMinimumScreenPercent * work_area.width() / 100);
 
   if (edge_ == LEFT_EDGE) {
     int x = work_area.x();
     int mid_x = x + width;
@@ skipping 35 matching lines @@
   return GetTargetBoundsForSize(size_index_);
 }
 
 bool SnapSizer::AlongEdge(int x) const {
   gfx::Rect area(ScreenAsh::GetDisplayBoundsInParent(window_));
   return (x <= area.x()) || (x >= area.right() - 1);
 }
 
 }  // namespace internal
 }  // namespace ash