rename getBitmapDC to beginPlatformPaint and add calls to endPlatformPaint

webkit/tools/test_shell/webwidget_host_win.cc

Index: webkit/tools/test_shell/webwidget_host_win.cc
diff --git a/webkit/tools/test_shell/webwidget_host_win.cc b/webkit/tools/test_shell/webwidget_host_win.cc
index 8056b46058537df354f33e3ffb66486210fa44e4..17d5ae110a3154204acf897e53cc444ecf508966 100644
--- a/webkit/tools/test_shell/webwidget_host_win.cc
+++ b/webkit/tools/test_shell/webwidget_host_win.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -251,12 +251,13 @@ void WebWidgetHost::Paint() {
   // Scroll the canvas if necessary
   scroll_rect_ = client_rect.Intersect(scroll_rect_);
   if (!scroll_rect_.IsEmpty()) {
-    HDC hdc = canvas_->getTopPlatformDevice().getBitmapDC();
+    HDC hdc = canvas_->beginPlatformPaint();
 
     RECT damaged_rect, r = scroll_rect_.ToRECT();
     ScrollDC(hdc, scroll_dx_, scroll_dy_, NULL, &r, NULL, &damaged_rect);
 
     PaintRect(gfx::Rect(damaged_rect));
+    canvas_->endPlatformPaint();
   }
   ResetScrollRect();