win: Fix black pixel artifact at right and bottom

ui/views/win/hwnd_message_handler.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/views/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <oleacc.h>
 #include <shellapi.h>
 #include <tchar.h>
@@ skipping 2103 matching lines @@
   // want Windows to draw the scrollbars. To achieve this we hide the scroll
   // bars and readd them to the window style in a posted task to ensure that we
   // don't get nested WM_SIZE messages.
   if (needs_scroll_styles_ && !in_size_loop_) {
     ShowScrollBar(hwnd(), SB_BOTH, FALSE);
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(&AddScrollStylesToWindow, hwnd()));
   }
 }
 
+void HWNDMessageHandler::OnSizing(UINT edge, RECT* rect) {
+  delegate_->HandleSizing(edge, rect);
+}
+
 void HWNDMessageHandler::OnSysCommand(UINT notification_code,
                                       const gfx::Point& point) {
   if (!delegate_->ShouldHandleSystemCommands())
     return;
 
   // Windows uses the 4 lower order bits of |notification_code| for type-
   // specific information so we must exclude this when comparing.
   static const int sc_mask = 0xFFF0;
   // Ignore size/move/maximize in fullscreen mode.
   if (IsFullscreen() && (((notification_code & sc_mask) == SC_SIZE) ||
@@ skipping 602 matching lines @@
   MONITORINFO monitor_info = {sizeof(monitor_info)};
   GetMonitorInfo(MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY),
                  &monitor_info);
   gfx::Rect shrunk_rect(monitor_info.rcMonitor);
   shrunk_rect.set_height(shrunk_rect.height() - 1);
   background_fullscreen_hack_ = true;
   SetBoundsInternal(shrunk_rect, false);
 }
 
 }  // namespace views