Add Toolbar test utility classes.

ios/shared/chrome/browser/ui/toolbar/toolbar_test_util.mm

+// Copyright 2017 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.
+
+#import "ios/shared/chrome/browser/ui/toolbar/toolbar_test_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+ToolbarTestWebState::ToolbarTestWebState() : loading_progress_(0){};
+
+double ToolbarTestWebState::GetLoadingProgress() const {
+  return loading_progress_;
+}
+
+void ToolbarTestWebState::set_loading_progress(double loading_progress) {
+  loading_progress_ = loading_progress;
+}
+
+ToolbarTestNavigationManager::ToolbarTestNavigationManager()
+    : can_go_back_(false), can_go_forward_(false) {}
+
+bool ToolbarTestNavigationManager::CanGoBack() const {
+  return can_go_back_;
+}
+
+bool ToolbarTestNavigationManager::CanGoForward() const {
+  return can_go_forward_;
+}
+
+void ToolbarTestNavigationManager::set_can_go_back(bool can_go_back) {
+  can_go_back_ = can_go_back;
+}
+
+void ToolbarTestNavigationManager::set_can_go_forward(bool can_go_forward) {
+  can_go_forward_ = can_go_forward;
+}