Attempt 2 at:...

app/gfx/path.h

 // Copyright (c) 2009 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.
 
 #ifndef APP_GFX_PATH_H_
 #define APP_GFX_PATH_H_
 
+#include "app/gfx/native_widget_types.h"
 #include "base/basictypes.h"
 
-#if defined(OS_WIN)
-#include <windows.h>
-#elif defined(OS_LINUX)
-typedef struct _GdkRegion GdkRegion;
-#endif
-
 #include "third_party/skia/include/core/SkPath.h"
 
 namespace gfx {
 
 class Path : public SkPath {
  public:
+  // Used by Path(Point,size_t) constructor.
+  struct Point {
+    int x;
+    int y;
+  };
+
   Path() : SkPath() { moveTo(0, 0); }
 
-#if defined(OS_WIN)
-  // Creates a HRGN from the path. The caller is responsible for freeing
-  // resources used by this region.  This only supports polygon paths.
-  HRGN CreateHRGN() const;
-#elif defined(OS_LINUX)
-  // Creates a Gdkregion from the path. The caller is responsible for freeing
-  // resources used by this region.  This only supports polygon paths.
-  // WARNING: this returns NULL for an empty Path.
-  GdkRegion* CreateGdkRegion() const;
+  // Creates a path populated with the specified points.
+  Path(const Point* points, size_t count);
+
+#if defined(OS_WIN) || defined(USE_X11)
+  // Creates a NativeRegion from the path. The caller is responsible for freeing
+  // resources used by this region. This only supports polygon paths.
+  NativeRegion CreateNativeRegion() const;
+
+  // Returns the intersection of the two regions. The caller owns the returned
+  // object.
+  static gfx::NativeRegion IntersectRegions(gfx::NativeRegion r1,
+                                            gfx::NativeRegion r2);
+
+  // Returns the union of the two regions. The caller owns the returned object.
+  static gfx::NativeRegion CombineRegions(gfx::NativeRegion r1,
+                                          gfx::NativeRegion r2);
+
+  // Returns the difference of the two regions. The caller owns the returned
+  // object.
+  static gfx::NativeRegion SubtractRegion(gfx::NativeRegion r1,
+                                          gfx::NativeRegion r2);
 #endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Path);
 };
 
 }
 
 #endif  // APP_GFX_PATH_H_