MacViews: Add native drop shadow to dialogs on OSX < 10.10.

ui/gfx/path_mac.h

Index: ui/gfx/path_mac.h
diff --git a/ui/gfx/path_mac.h b/ui/gfx/path_mac.h
new file mode 100644
index 0000000000000000000000000000000000000000..6b5495932ae2aef8b0ac8a93591484729f5edee4
--- /dev/null
+++ b/ui/gfx/path_mac.h
@@ -0,0 +1,29 @@
+// Copyright (c) 2016 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 UI_GFX_PATH_MAC_H_
+#define UI_GFX_PATH_MAC_H_
+
+#include "ui/gfx/gfx_export.h"
+
+#if defined(__OBJC__)
+@class NSBezierPath;
+#else   // __OBJC__
+class NSBezierPath;
+#endif  // __OBJC__
+
+class SkPath;
+class SkRegion;
+
+namespace gfx {
+
+// Returns the NSBezierPath corresponding to |region|.
+GFX_EXPORT NSBezierPath* CreateNSBezierPathFromSkRegion(const SkRegion& region);
+
+// Returns the NSBezierPath corresponding to |path|.
+GFX_EXPORT NSBezierPath* CreateNSBezierPathFromSkPath(const SkPath& path);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_PATH_MAC_H_