Use mojo app list interfaces for mash and classic ash.

ash/test/test_app_list_presenter_impl.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 ASH_TEST_TEST_APP_LIST_PRESENTER_IMPL_H_
+#define ASH_TEST_TEST_APP_LIST_PRESENTER_IMPL_H_
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+#include "ui/app_list/presenter/app_list_presenter_impl.h"
+
+namespace ash {
+namespace test {
+
+// A test implementation of the app list presenter, using ash's delegate.
+// Some tests rely on the presenter and delegate implementations' behavior.
+class TestAppListPresenterImpl : public app_list::AppListPresenterImpl {

[mfomitchev, 2016/12/22 18:27:11]

Nit: Maybe call this AppListPresenterWrapper or AppListPresenterInitializer?
This is not really a "test" implementation like
app_list::test::TestAppListPresenter - it's a convenience wrapper around a real
implementation.

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

Technically this is an AppListPresenterImpl that uses a
TestAppListViewDelegateFactory under the hood; in that sense it's a presenter
subclass used for testing purposes. But you're right, the name is a bit
off-point; I changed it to TestAppListViewPresenterImpl, "a presenter impl of
the test app list view...".

+ public:
+  TestAppListPresenterImpl();
+  ~TestAppListPresenterImpl() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestAppListPresenterImpl);
+};
+
+}  // namespace test
+}  // namespace ash
+
+#endif  // ASH_TEST_TEST_APP_LIST_PRESENTER_IMPL_H_