Free the dibsection (HBITMAP) in PlatformBitmap's destructor, so we don't leak!

skia/ext/bitmap_platform_device_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 <windows.h>
 #include <psapi.h>
 
 #include "skia/ext/bitmap_platform_device_win.h"
 #include "skia/ext/bitmap_platform_device_data.h"
 #include "skia/ext/platform_canvas.h"
@@ skipping 255 matching lines @@
   SkDevice* bitmap_device = BitmapPlatformDevice::CreateAndClear(width, height,
                                                                  isOpaque);
   return bitmap_device;
 }
 
 // Port of PlatformBitmap to win
 
 PlatformBitmap::~PlatformBitmap() {
   if (surface_)
     DeleteDC(surface_);
+
+  HBITMAP hbitmap = (HBITMAP)platform_extra_;
+  if (hbitmap)
+    DeleteObject(hbitmap);
 }
 
 bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
   HBITMAP hbitmap = CreateHBitmap(width, height, is_opaque, 0, &bitmap_);
   if (!hbitmap)
     return false;
 
   surface_ = CreateCompatibleDC(NULL);
   InitializeDC(surface_);
   HGDIOBJ old_bitmap = SelectObject(surface_, hbitmap);
   // When the memory DC is created, its display surface is exactly one
   // monochrome pixel wide and one monochrome pixel high. Since we select our
   // own bitmap, we must delete the previous one.
   DeleteObject(old_bitmap);
+  // remember the hbitmap, so we can free it in our destructor
+  platform_extra_ = (intptr_t)hbitmap;
   return true;
 }
 
 }  // namespace skia