mash: Have chrome set itself as the app list presenter.

ui/app_list/presenter/app_list.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 UI_APP_LIST_PRESENTER_APP_LIST_H_
+#define UI_APP_LIST_PRESENTER_APP_LIST_H_
+
+#include "mojo/public/cpp/bindings/binding_set.h"
+#include "ui/app_list/presenter/app_list_presenter.mojom.h"
+#include "ui/app_list/presenter/app_list_presenter_export.h"
+
+namespace app_list {
+
+// Interface for setting the app list presenter.

[mfomitchev, 2016/12/12 22:59:50]

Maybe something like this?
Exposes interface for setting app list presenter. Stores the interface pointer
for later use by whoever needs it.

[msw, 2016/12/12 23:47:54]

I went with "// Stores the app list presenter interface pointer."

+class APP_LIST_PRESENTER_EXPORT AppList : public mojom::AppList {
+ public:
+  AppList();
+  ~AppList() override;
+
+  // Binds the mojom::AppList interface request to this object.
+  void BindRequest(mojom::AppListRequest request);
+
+  // Get a raw pointer to the mojom::AppListPresenter interface; may be null.
+  mojom::AppListPresenter* GetAppListPresenter();
+
+  // mojom::AppList:
+  void SetAppListPresenter(mojom::AppListPresenterPtr presenter) override;
+
+ private:
+  // Bindings for the mojom::AppList interface.
+  mojo::BindingSet<mojom::AppList> bindings_;
+
+  // App list presenter interface in chrome; used to show/hide the app list.
+  mojom::AppListPresenterPtr presenter_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppList);
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_PRESENTER_APP_LIST_H_