Refactors WindowResizers to use ash/wm/common

ash/wm/common/shelf/wm_shelf_util.h

Index: ash/wm/common/shelf/wm_shelf_util.h
diff --git a/ash/wm/common/shelf/wm_shelf_util.h b/ash/wm/common/shelf/wm_shelf_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..2405622d2360bbb6be53215f8ea3c81c29da9176
--- /dev/null
+++ b/ash/wm/common/shelf/wm_shelf_util.h
@@ -0,0 +1,20 @@
+// 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_UTIL_H_
+#define ASH_WM_COMMON_SHELF_WM_SHELF_UTIL_H_
+
+#include "ash/ash_export.h"
+#include "ash/wm/common/shelf/wm_shelf_types.h"
+
+namespace ash {
+namespace wm {
+
+// Returns true if the shelf |alignment| is horizontal.
+ASH_EXPORT bool IsHorizontalAlignment(ShelfAlignment alignment);
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_COMMON_SHELF_WM_SHELF_UTIL_H_