Add a TestBrowserDialog helper class for testing browser dialogs in a consistent way.

ui/base/test/material_design_controller_test_api.h

 // Copyright 2015 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_BASE_TEST_MATERIAL_DESIGN_CONTROLLER_TEST_API_H_
 #define UI_BASE_TEST_MATERIAL_DESIGN_CONTROLLER_TEST_API_H_
 
 #include "base/macros.h"
 #include "ui/base/material_design/material_design_controller.h"
 
 namespace ui {
 namespace test {
 
 // Test API to access the internal state of the MaterialDesignController class.
 // Creating an instance of this class and then destroying it preserves global
 // state in MaterialDesignController class.
 class MaterialDesignControllerTestAPI {
  public:
   explicit MaterialDesignControllerTestAPI(MaterialDesignController::Mode mode);
   ~MaterialDesignControllerTestAPI();
 
+  // Force the given |value| for IsSecondaryUiMaterial() for the lifetime of the
+  // test API.
+  void SetSecondaryUiMaterial(bool value);
+
   // Wrapper functions for MaterialDesignController internal functions.
   static void Uninitialize();
 
  private:
   const MaterialDesignController::Mode previous_mode_;
   const bool previous_initialized_;
+  const bool previous_include_secondary_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MaterialDesignControllerTestAPI);
 };
 
 }  // namespace test
 }  // namespace ui
 
 #endif  // UI_BASE_TEST_MATERIAL_DESIGN_CONTROLLER_TEST_API_H_