Add basic Chrome interaction with the mash shelf.

chrome/browser/ui/ash/launcher/chrome_mash_shelf_controller.h

Index: chrome/browser/ui/ash/launcher/chrome_mash_shelf_controller.h
diff --git a/chrome/browser/ui/ash/launcher/chrome_mash_shelf_controller.h b/chrome/browser/ui/ash/launcher/chrome_mash_shelf_controller.h
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+// 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 CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_MASH_SHELF_CONTROLLER_H_
+#define CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_MASH_SHELF_CONTROLLER_H_
+
+#include <map>
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "mash/shelf/public/interfaces/shelf.mojom.h"
+#include "mojo/public/cpp/bindings/associated_binding.h"
+
+class ChromeShelfItemDelegate;
+
+// ChromeMashShelfController manages chrome's interaction with the mash shelf.
+class ChromeMashShelfController : public mash::shelf::mojom::ShelfObserver {
+ public:
+  ~ChromeMashShelfController() override;
+
+  // Creates an instance.
+  static ChromeMashShelfController* CreateInstance();
+
+  // Returns the single ChromeMashShelfController instance.
+  static ChromeMashShelfController* instance() { return instance_; }
+
+ private:
+  ChromeMashShelfController();
+
+  void Init();
+
+  // mash::shelf::mojom::ShelfObserver:
+  void OnAlignmentChanged(mash::shelf::mojom::Alignment alignment) override;
+  void OnAutoHideBehaviorChanged(
+      mash::shelf::mojom::AutoHideBehavior auto_hide) override;
+
+  static ChromeMashShelfController* instance_;
+
+  mash::shelf::mojom::ShelfControllerPtr shelf_controller_;
+  mojo::AssociatedBinding<mash::shelf::mojom::ShelfObserver> observer_binding_;
+  std::map<std::string, scoped_ptr<ChromeShelfItemDelegate>>
+      app_id_to_item_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeMashShelfController);
+};
+
+#endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_MASH_SHELF_CONTROLLER_H_