Only Update the Scale Factor if the Scale Factor Actually Changed

ui/views/win/hwnd_message_handler.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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 
 #include <stddef.h>
@@ skipping 544 matching lines @@
   // The last cursor that was active before the current one was selected. Saved
   // so that we can restore it.
   HCURSOR previous_cursor_;
 
   // The icon created from the bitmap image of the window icon.
   base::win::ScopedHICON window_icon_;
 
   // The icon created from the bitmap image of the app icon.
   base::win::ScopedHICON app_icon_;
 
+  // The current DPI.
+  int dpi_;
+
   // Event handling ------------------------------------------------------------
 
   // The flags currently being used with TrackMouseEvent to track mouse
   // messages. 0 if there is no active tracking. The value of this member is
   // used when tracking is canceled.
   DWORD active_mouse_tracking_flags_;
 
   // Set to true when the user presses the right mouse button on the caption
   // area. We need this so we can correctly show the context menu on mouse-up.
   bool is_right_mouse_pressed_on_caption_;
@@ skipping 109 matching lines @@
 
   // The factory used with BEGIN_SAFE_MSG_MAP_EX.
   base::WeakPtrFactory<HWNDMessageHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_