Fix regions generation on windows.

ui/gfx/path_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/gfx/path_win.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/win/scoped_gdi_object.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/gfx/path.h"
 
 namespace gfx {
 
 HRGN CreateHRGNFromSkRegion(const SkRegion& region) {
   base::win::ScopedRegion temp(::CreateRectRgn(0, 0, 0, 0));
   base::win::ScopedRegion result(::CreateRectRgn(0, 0, 0, 0));
 
   for (SkRegion::Iterator i(region); !i.done(); i.next()) {
     const SkIRect& rect = i.rect();
     ::SetRectRgn(temp, rect.left(), rect.top(), rect.right(), rect.bottom());
     ::CombineRgn(result, result, temp, RGN_OR);
   }
 
   return result.release();
 }
 
 HRGN CreateHRGNFromSkPath(const SkPath& path) {
-  int point_count = path.getPoints(NULL, 0);
-  scoped_ptr<SkPoint[]> points(new SkPoint[point_count]);
-  path.getPoints(points.get(), point_count);
-  scoped_ptr<POINT[]> windows_points(new POINT[point_count]);
-  for (int i = 0; i < point_count; ++i) {
-    windows_points[i].x = SkScalarRoundToInt(points[i].fX);
-    windows_points[i].y = SkScalarRoundToInt(points[i].fY);
-  }
-
-  return ::CreatePolygonRgn(windows_points.get(), point_count, ALTERNATE);
+  SkRegion clip_region;
+  clip_region.setRect(path.getBounds().round());
+  SkRegion region;
+  if (region.setPath(path, clip_region))
+    return NULL;
+  return CreateHRGNFromSkRegion(region);
 }
 
 // See path_aura.cc for Aura definition of these methods:
 #if !defined(USE_AURA)
 
 NativeRegion Path::CreateNativeRegion() const {
   return CreateHRGNFromSkPath(*this);
 }
 
 // static
@@ skipping 13 matching lines @@
 // static
 NativeRegion Path::SubtractRegion(NativeRegion r1, NativeRegion r2) {
   HRGN dest = CreateRectRgn(0, 0, 1, 1);
   CombineRgn(dest, r1, r2, RGN_DIFF);
   return dest;
 }
 
 #endif
 
 }  // namespace gfx