Add IPC messages and structs for passing draggable regions.

common/draggable_region.h

@@ -0,0 +1,21 @@
+// 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 ATOM_COMMON_DRAGGABLE_REGION_H_
+#define ATOM_COMMON_DRAGGABLE_REGION_H_
+
+#include "ui/gfx/rect.h"
+
+namespace atom {
+
+struct DraggableRegion {
+  bool draggable;
+  gfx::Rect bounds;
+
+  DraggableRegion();
+};
+
+}  // namespace atom
+
+#endif  // ATOM_COMMON_DRAGGABLE_REGION_H_