Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/wm/common/shelf/wm_shelf_types.h

Index: ash/wm/common/shelf/wm_shelf_types.h
diff --git a/ash/wm/common/shelf/wm_shelf_types.h b/ash/wm/common/shelf/wm_shelf_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..469491f564cc29e173932a7ea17c472292dc5a66
--- /dev/null
+++ b/ash/wm/common/shelf/wm_shelf_types.h
@@ -0,0 +1,35 @@
+// Copyright 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 ASH_WM_COMMON_SHELF_WM_SHELF_TYPES_H_
+#define ASH_WM_COMMON_SHELF_WM_SHELF_TYPES_H_
+
+namespace ash {
+namespace wm {
+
+enum ShelfAlignment {
+  SHELF_ALIGNMENT_BOTTOM,
+  SHELF_ALIGNMENT_LEFT,
+  SHELF_ALIGNMENT_RIGHT,
+  // Top has never been supported.
+
+  // The locked alignment is set temporarily and not saved to preferences.
+  SHELF_ALIGNMENT_BOTTOM_LOCKED,
+};
+
+enum ShelfBackgroundType {
+  // The default transparent background.
+  SHELF_BACKGROUND_DEFAULT,
+
+  // The background when a window is overlapping.
+  SHELF_BACKGROUND_OVERLAP,
+
+  // The background when a window is maximized.
+  SHELF_BACKGROUND_MAXIMIZED,
+};
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_COMMON_SHELF_WM_SHELF_TYPES_H_