[wip] test branch in win native theme

ui/native_theme/native_theme_win.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/native_theme/native_theme_win.h"
 
 #include <windows.h>
 #include <stddef.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
@@ skipping 262 matching lines @@
       return;
     case kMenuItemBackground:
       CommonThemePaintMenuItemBackground(this, canvas, state, rect,
                                          extra.menu_item);
       return;
     default:
       break;
   }
 
   HDC surface = skia::GetNativeDrawingContext(canvas);
+  CHECK(!surface);
 
   // When drawing the task manager or the bookmark editor, we draw into an
   // offscreen buffer, where we can use OS-specific drawing routines for
   // UI features like scrollbars. However, we need to set up that buffer,
   // and then read it back when it's done and blit it onto the screen.
 
   if (surface)
     PaintDirect(canvas, surface, part, state, rect, extra);
   else
     PaintIndirect(canvas, part, state, rect, extra);
@@ skipping 1808 matching lines @@
     break;
   case LAST:
     NOTREACHED();
     break;
   }
   theme_handles_[theme_name] = handle;
   return handle;
 }
 
 }  // namespace ui