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

ui/base/test/material_design_controller_test_api.cc

 // 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.
 
 #include "ui/base/test/material_design_controller_test_api.h"
 
 namespace ui {
 namespace test {
 
 MaterialDesignControllerTestAPI::MaterialDesignControllerTestAPI(
     MaterialDesignController::Mode mode)
     : previous_mode_(MaterialDesignController::mode_),
-      previous_initialized_(MaterialDesignController::is_mode_initialized_) {
+      previous_initialized_(MaterialDesignController::is_mode_initialized_),
+      previous_include_secondary_ui_(
+          MaterialDesignController::include_secondary_ui_) {
   MaterialDesignController::SetMode(mode);
 }
 
 MaterialDesignControllerTestAPI::~MaterialDesignControllerTestAPI() {
+  MaterialDesignController::include_secondary_ui_ =
+      previous_include_secondary_ui_;
   MaterialDesignController::is_mode_initialized_ = previous_initialized_;
   MaterialDesignController::mode_ = previous_mode_;
 }
 
+void MaterialDesignControllerTestAPI::SetSecondaryUiMaterial(bool value) {
+  MaterialDesignController::include_secondary_ui_ = value;
+}
+
 void MaterialDesignControllerTestAPI::Uninitialize() {
   MaterialDesignController::Uninitialize();
 }
 
 }  // namespace test
 }  // namespace ui