Add Plumbing for WM_DPICHANGED

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 312 matching lines @@
                                 WM_NCXBUTTONDBLCLK,
                                 OnMouseRange)
 
     // CustomFrameWindow hacks
     CR_MESSAGE_HANDLER_EX(WM_NCUAHDRAWCAPTION, OnNCUAHDrawCaption)
     CR_MESSAGE_HANDLER_EX(WM_NCUAHDRAWFRAME, OnNCUAHDrawFrame)
 
     // Vista and newer
     CR_MESSAGE_HANDLER_EX(WM_DWMCOMPOSITIONCHANGED, OnDwmCompositionChanged)
 
+    // Win 8.1 and newer
+    CR_MESSAGE_HANDLER_EX(WM_DPICHANGED, OnDpiChanged)
+
     // Non-atlcrack.h handlers
     CR_MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject)
 
     // Mouse events.
     CR_MESSAGE_HANDLER_EX(WM_MOUSEACTIVATE, OnMouseActivate)
     CR_MESSAGE_HANDLER_EX(WM_MOUSELEAVE, OnMouseRange)
     CR_MESSAGE_HANDLER_EX(WM_NCMOUSELEAVE, OnMouseRange)
     CR_MESSAGE_HANDLER_EX(WM_SETCURSOR, OnSetCursor);
 
     // Pointer events.
@@ skipping 72 matching lines @@
   // TODO(beng): return BOOL is temporary until this object becomes a
   //             WindowImpl.
   BOOL OnAppCommand(HWND window, short command, WORD device, int keystate);
   void OnCancelMode();
   void OnCaptureChanged(HWND window);
   void OnClose();
   void OnCommand(UINT notification_code, int command, HWND window);
   LRESULT OnCreate(CREATESTRUCT* create_struct);
   void OnDestroy();
   void OnDisplayChange(UINT bits_per_pixel, const gfx::Size& screen_size);
+  LRESULT OnDpiChanged(UINT msg, WPARAM w_param, LPARAM l_param);
   LRESULT OnDwmCompositionChanged(UINT msg, WPARAM w_param, LPARAM l_param);
   void OnEnterMenuLoop(BOOL from_track_popup_menu);
   void OnEnterSizeMove();
   LRESULT OnEraseBkgnd(HDC dc);
   void OnExitMenuLoop(BOOL is_shortcut_menu);
   void OnExitSizeMove();
   void OnGetMinMaxInfo(MINMAXINFO* minmax_info);
   LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnImeMessages(UINT message, WPARAM w_param, LPARAM l_param);
   void OnInitMenu(HMENU menu);
@@ skipping 240 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_