Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/wm/common/shelf/wm_shelf_constants.h

+// 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_CONSTANTS_H_
+#define ASH_WM_COMMON_SHELF_WM_SHELF_CONSTANTS_H_
+
+#include "ash/ash_export.h"
+
+namespace ash {
+namespace wm {
+
+// Max alpha of the shelf background.
+ASH_EXPORT extern const int kShelfBackgroundAlpha;

[James Cook, 2016/04/26 15:22:34]

I know you just moved these from elsewhere, but do they need to be ASH_EXPORT? I
don't see them used outside src/ash. If not, do they need to be extern?

[sky, 2016/04/26 16:26:02]

At this point I think you're right. But soonish ash/wm/common is going to be
it's own dll, which it's own export. So, I'm going to leave it like this to make
the search/replace easier.

+
+// Animation duration for switching black shelf and dock background on and off.
+ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_COMMON_SHELF_WM_SHELF_CONSTANTS_H_