cros: Simple password view for lock. Adds test support.

ash/login/ui/login_test_base.cc

+// 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.
+
+#include "ash/login/ui/login_test_base.h"
+
+#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_delegate.h"
+
+namespace ash {
+
+// A WidgetDelegate which ensures that |initially_focused| gets focus.
+class LoginTestBase::WidgetDelegate : public views::WidgetDelegate {
+ public:
+  WidgetDelegate(views::View* content) : content_(content) {}
+  ~WidgetDelegate() override = default;
+
+  // views::WidgetDelegate:
+  views::View* GetInitiallyFocusedView() override { return content_; }
+  views::Widget* GetWidget() override { return content_->GetWidget(); }
+  const views::Widget* GetWidget() const override {
+    return content_->GetWidget();
+  }
+
+ private:
+  views::View* content_;
+
+  DISALLOW_COPY_AND_ASSIGN(WidgetDelegate);
+};
+
+LoginTestBase::LoginTestBase() {}
+
+LoginTestBase::~LoginTestBase() {}
+
+void LoginTestBase::ShowWidgetWithContent(views::View* content) {
+  EXPECT_FALSE(widget_) << "CreateWidget can only be called once.";
+
+  delegate_ = base::MakeUnique<WidgetDelegate>(content);
+
+  views::Widget::InitParams params(
+      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+  params.context = CurrentContext();
+  params.bounds = gfx::Rect(0, 0, 800, 800);
+  params.delegate = delegate_.get();
+  widget_ = new views::Widget();
+  widget_->Init(params);
+  widget_->SetContentsView(content);
+  widget_->Show();
+}
+
+void LoginTestBase::TearDown() {
+  if (widget_) {
+    widget_->Close();
+    widget_ = nullptr;
+  }
+
+  test::AshTestBase::TearDown();
+}
+
+}  // namespace ash