Moves WindowCycleList/Controller to ash/common

ash/wm/window_mirror_view.h

Index: ash/wm/window_mirror_view.h
diff --git a/ash/wm/window_mirror_view.h b/ash/wm/window_mirror_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..268ea10833bfa23c326e37cc636aad96c6a692cb
--- /dev/null
+++ b/ash/wm/window_mirror_view.h
@@ -0,0 +1,60 @@
+// 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_WINDOW_MIRROR_VIEW_H_
+#define ASH_WM_WINDOW_MIRROR_VIEW_H_
+
+#include <memory>
+#include <vector>
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+#include "ui/views/view.h"
+#include "ui/wm/core/window_util.h"
+
+namespace ash {
+
+class WmWindowAura;
+
+namespace wm {
+
+class ForwardingLayerDelegate;
+
+// A view that mirrors a single window. Layers are lifted from the underlying
+// window (which gets new ones in their place). New paint calls, if any, are
+// forwarded to the underlying window.
+class WindowMirrorView : public views::View, public ::wm::LayerDelegateFactory {
+ public:
+  explicit WindowMirrorView(WmWindowAura* window);
+  ~WindowMirrorView() override;
+
+  void Init();
+
+  // views::View:
+  gfx::Size GetPreferredSize() const override;
+  void Layout() override;
+
+  // ::wm::LayerDelegateFactory:
+  ui::LayerDelegate* CreateDelegate(ui::LayerDelegate* delegate) override;
+
+ private:
+  // Gets the root of the layer tree that was lifted from |target_| (and is now
+  // a child of |this->layer()|).
+  ui::Layer* GetMirrorLayer();
+
+  // The original window that is being represented by |this|.
+  WmWindowAura* target_;
+
+  // Retains ownership of the mirror layer tree.
+  std::unique_ptr<ui::LayerTreeOwner> layer_owner_;
+
+  std::vector<std::unique_ptr<ForwardingLayerDelegate>> delegates_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowMirrorView);
+};
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_WINDOW_MIRROR_VIEW_H_