Make SkOSWindow windows implementation use CS_OWNDC in its window class

src/views/win/skia_win.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include <windows.h>
 #include <tchar.h>
 
 #include "SkTypes.h"
 #include "SkApplication.h"
 #include "SkOSWindow_Win.h"
 
 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 
 // Returns the main window Win32 class name.
 static const TCHAR* register_class(HINSTANCE hInstance) {
     WNDCLASSEX wcex;
     // The main window class name
     static const TCHAR gSZWindowClass[] = _T("SkiaApp");
 
     wcex.cbSize = sizeof(WNDCLASSEX);
 
-    wcex.style          = CS_HREDRAW | CS_VREDRAW;
+    wcex.style          = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
     wcex.lpfnWndProc    = WndProc;
     wcex.cbClsExtra     = 0;
     wcex.cbWndExtra     = 0;
     wcex.hInstance      = hInstance;
     wcex.hIcon          = NULL;
     wcex.hCursor        = NULL;
     wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
     wcex.lpszMenuName   = NULL;
     wcex.lpszClassName  = gSZWindowClass;
     wcex.hIconSm        = NULL;
@@ skipping 89 matching lines @@
             if (window && window->wndProc(hWnd, message, wParam, lParam)) {
                 return 0;
             } else {
                 return DefWindowProc(hWnd, message, wParam, lParam);
             }
         }
     }
     return 0;
 }