Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/wm/aura/wm_shelf_aura.cc

Index: ash/wm/aura/wm_shelf_aura.cc
diff --git a/ash/wm/aura/wm_shelf_aura.cc b/ash/wm/aura/wm_shelf_aura.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f4145861ccc9d048b9af6e2be712d79fe558a9ae
--- /dev/null
+++ b/ash/wm/aura/wm_shelf_aura.cc
@@ -0,0 +1,63 @@
+// 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.
+
+#include "ash/wm/aura/wm_shelf_aura.h"
+
+#include "ash/shelf/shelf.h"
+#include "ash/shelf/shelf_layout_manager.h"
+#include "ash/wm/common/shelf/wm_shelf_observer.h"
+#include "ash/wm/common/wm_window.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+namespace wm {
+
+WmShelfAura::WmShelfAura(Shelf* shelf)
+    : shelf_(shelf), shelf_layout_manager_(shelf->shelf_layout_manager()) {
+  shelf_layout_manager_->AddObserver(this);
+}
+
+WmShelfAura::~WmShelfAura() {
+  if (shelf_layout_manager_)
+    shelf_layout_manager_->RemoveObserver(this);
+}
+
+WmWindow* WmShelfAura::GetWindow() {
+  return WmWindow::Get(shelf_->shelf_widget());
+}
+
+ShelfAlignment WmShelfAura::GetAlignment() {
+  return shelf_->alignment();
+}
+
+ShelfBackgroundType WmShelfAura::GetBackgroundType() {
+  return shelf_->shelf_widget()->GetBackgroundType();
+}
+
+void WmShelfAura::UpdateVisibilityState() {
+  shelf_->shelf_layout_manager()->UpdateVisibilityState();
+}
+
+void WmShelfAura::AddObserver(WmShelfObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void WmShelfAura::RemoveObserver(WmShelfObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void WmShelfAura::WillDeleteShelf() {
+  shelf_layout_manager_->RemoveObserver(this);
+  shelf_layout_manager_ = nullptr;
+}
+
+void WmShelfAura::OnBackgroundUpdated(
+    wm::ShelfBackgroundType background_type,
+    BackgroundAnimatorChangeType change_type) {
+  FOR_EACH_OBSERVER(WmShelfObserver, observers_,
+                    OnBackgroundUpdated(background_type, change_type));
+}
+
+}  // namespace wm
+}  // namespace ash