Draggable region support for frameless app window on Windows.

chrome/common/extensions/draggable_region.h

Index: chrome/common/extensions/draggable_region.h
diff --git a/chrome/common/extensions/draggable_region.h b/chrome/common/extensions/draggable_region.h
new file mode 100644
index 0000000000000000000000000000000000000000..e8e1daa1faeeb9ebffc798ecf588e90c3d396619
--- /dev/null
+++ b/chrome/common/extensions/draggable_region.h
@@ -0,0 +1,20 @@
+// 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.
+
+#ifndef CHROME_COMMON_EXTENSIONS_DRAGGABLE_REGION_H_
+#define CHROME_COMMON_EXTENSIONS_DRAGGABLE_REGION_H_
+
+#include "ui/gfx/rect.h"
+
+namespace extensions {
+
+struct DraggableRegion {
+  std::string label;
+  gfx::Rect bounds;
+  gfx::Rect clip;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_DRAGGABLE_REGION_H_