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

ash/wm/workspace/snap_sizer.cc

Index: ash/wm/workspace/snap_sizer.cc
diff --git a/ash/wm/workspace/snap_sizer.cc b/ash/wm/workspace/snap_sizer.cc
index 06a80e900936644f0f3e71190227b984773b74bd..fa6c3a4eefc1e0de01b4d1f18e1eacdc738b0b04 100644
--- a/ash/wm/workspace/snap_sizer.cc
+++ b/ash/wm/workspace/snap_sizer.cc
@@ -100,9 +100,10 @@ gfx::Rect SnapSizer::GetTargetBoundsForSize(size_t size_index) const {
     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];
     }
   }