rename getBitmapDC to beginPlatformPaint and add calls to endPlatformPaint

ui/views/widget/native_widget_win.cc

 // 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.
 
 #include "ui/views/widget/native_widget_win.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/system_monitor/system_monitor.h"
 #include "ui/base/view_prop.h"
 #include "ui/base/win/hwnd_util.h"
@@ skipping 442 matching lines @@
     GetUpdateRect(hwnd(), &r, FALSE);
     window_contents_->ClipRectInt(r.left, r.top, r.right - r.left,
                                   r.bottom - r.top);
     listener_->OnPaint(window_contents_.get());
     window_contents_->restore();
 
     RECT wr;
     GetWindowRect(hwnd(), &wr);
     SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
     POINT position = {wr.left, wr.top};
-    HDC dib_dc = window_contents_->getTopPlatformDevice().getBitmapDC();
+    HDC dib_dc = window_contents_->beginPlatformPaint();
     POINT zero = {0, 0};
     BLENDFUNCTION blend = {AC_SRC_OVER, 0, 125, AC_SRC_ALPHA};
     UpdateLayeredWindow(hwnd(), NULL, &position, &size, dib_dc, &zero,
                         RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
+    window_contents_->endPlatformPaint();
   } else {
     scoped_ptr<gfx::CanvasPaint> canvas(
         gfx::CanvasPaint::CreateCanvasPaint(hwnd()));
     listener_->OnPaint(canvas->AsCanvas());
   }
 }
 
 LRESULT NativeWidgetWin::OnPowerBroadcast(DWORD power_event, DWORD data) {
   SystemMonitor* monitor = SystemMonitor::Get();
   if (monitor)
@@ skipping 184 matching lines @@
     if (parent_widget) {
       widget = parent_widget;
       parent_hwnd = ::GetAncestor(parent_hwnd, GA_PARENT);
     }
   } while (parent_hwnd != NULL && parent_widget != NULL);
 
   return widget;
 }
 
 }  // namespace ui