Adding new maximize menu according to spec

ash/wm/workspace/snap_types.h

Index: ash/wm/workspace/snap_types.h
diff --git a/ash/wm/workspace/snap_types.h b/ash/wm/workspace/snap_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..482a7dd583bed68d88ecfa235f92ce13ae0fa6c3
--- /dev/null
+++ b/ash/wm/workspace/snap_types.h
@@ -0,0 +1,23 @@
+// 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 ASH_WM_WORKSPACE_SNAP_TYPES_H_
+#define ASH_WM_WORKSPACE_SNAP_TYPES_H_
+
+namespace ash {
+
+// These are the window snap types which can be used for window resizing.
+// Their main use case is the class FrameMaximizeButton.
+enum SnapType {
+  SNAP_LEFT,
+  SNAP_RIGHT,
+  SNAP_MAXIMIZE,
+  SNAP_MINIMIZE,
+  SNAP_RESTORE,
+  SNAP_NONE
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_WORKSPACE_SNAP_TYPES_H_