Use mojo app list interfaces for mash and classic ash.

ash/shell/example_app_list_presenter.cc

+// 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/shell/example_app_list_presenter.h"
+
+#include "ash/shell/example_factory.h"
+#include "ui/app_list/presenter/app_list_view_delegate_factory.h"
+
+namespace {
+
+// An example app list view delegate factory.
+class ExampleAppListViewDelegateFactory
+    : public app_list::AppListViewDelegateFactory {
+ public:
+  ExampleAppListViewDelegateFactory() {}
+  ~ExampleAppListViewDelegateFactory() override {}
+
+  app_list::AppListViewDelegate* GetDelegate() override {

[Daniel Erat, 2016/12/22 18:17:57]

ui/app_list/presenter/app_list_view_delegate_factory.h doesn't have any
comments, but should this be named CreateDelegate() instead? i'd expect a "get"
method to return some existing object. does ownership get passed?

[msw, 2016/12/23 03:59:34]

This indeed passes a pointer to an existing (or lazily constructed) object owned
elsewhere (and I fixed ExampleAppListViewDelegateFactory to do the same). I
added a comment to the declaration. FYI, I tried changing the ownership model
here, but it gets hairy around AppListServiceImpl, etc. I hope this can be
simplified in the future (avoid the factory altogether or similar).

+    return ash::shell::CreateAppListViewDelegate();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ExampleAppListViewDelegateFactory);
+};
+
+}  // namespace
+
+namespace ash {
+namespace shell {
+
+ExampleAppListPresenter::ExampleAppListPresenter()
+    : binding_(this),
+      app_list_presenter_delegate_factory_(
+          base::MakeUnique<ExampleAppListViewDelegateFactory>()),
+      app_list_presenter_impl_(&app_list_presenter_delegate_factory_) {
+  // Note: This example |app_list_presenter_impl_| does not report visibility
+  // changes to the app_list::mojom::AppList implementation owned by WmShell.
+}
+
+ExampleAppListPresenter::~ExampleAppListPresenter() {}
+
+app_list::mojom::AppListPresenterPtr
+ExampleAppListPresenter::CreateInterfacePtrAndBind() {
+  return binding_.CreateInterfacePtrAndBind();
+}
+
+void ExampleAppListPresenter::Show(int64_t display_id) {
+  app_list_presenter_impl_.Show(display_id);
+}
+
+void ExampleAppListPresenter::Dismiss() {
+  app_list_presenter_impl_.Dismiss();
+}
+
+void ExampleAppListPresenter::ToggleAppList(int64_t display_id) {
+  app_list_presenter_impl_.ToggleAppList(display_id);
+}
+
+}  // namespace shell
+}  // namespace ash