Fix regions generation on windows.

ui/gfx/path_win_unittest.cc

+// Copyright 2014 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 "base/win/scoped_gdi_object.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkRRect.h"
+#include "ui/gfx/path.h"
+#include "ui/gfx/path_win.h"
+
+// Test that rectangle with round corners stil has _round_ corners after
+// converting from SkPath to the HRGN.
+// Old implementation of the CreateHRGNFromSkPath operates with polygons and
+// can't make round corners.
+TEST(CreateHRGNFromSkPathTest, RoundCornerTest) {
+  struct TestPoint {
+    int x;
+    int y;
+    bool in_region;
+  };
+  const TestPoint points[] = {
+      { 0, 20, true },
+      { 0, 19, true },
+      { 0, 18, true },
+      { 0, 17, true },
+      { 0, 16, false },
+      { 1, 16, true },
+      { 1, 15, true },
+      { 1, 14, true },
+      { 1, 13, true },
+      { 1, 12, true },
+      { 1, 11, false },
+      { 2, 11, true },
+      { 2, 10, false },
+      { 3, 10, true },
+      { 3, 9, true },
+      { 3, 8, false },
+      { 4, 8, true },
+      { 4, 7, false },
+      { 5, 7, true },
+      { 5, 6, true },
+      { 5, 5, false },
+      { 6, 5, true },
+      { 6, 4, false},
+      { 7, 4, false },
+      { 8, 4, true },
+      { 8, 3, false },
+      { 9, 3, true },
+      { 9, 2, false },
+      { 10, 2, false },
+      { 11, 2, true },
+      { 11, 1, false },
+      { 12, 1, true },
+      { 12, 0, false },
+      { 13, 0, false },
+      { 14, 0, false },
+      { 15, 0, false },
+      { 16, 0, false },
+      { 17, 0, true },
+      { 18, 0, true },
+      { 19, 0, true },
+      { 20, 0, true },
+      };

[Alexei Svitkine (slow), 2014/10/22 15:14:46]

Nit: De-indent this.

+
+  gfx::Path path;
+  SkRRect rrect;
+  rrect.setRectXY(SkRect::MakeWH(50, 50), 20, 20);
+  path.addRRect(rrect);
+  base::win::ScopedRegion region(gfx::CreateHRGNFromSkPath(path));
+  for (const TestPoint& point : points) {
+    EXPECT_EQ(point.in_region, !!::PtInRegion(region, point.x, point.y));
+  }
+}