cros: Initial structure for views-based lock.

ash/login/views/contents_view.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/views/contents_view.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "ui/views/background.h"
+#include "ui/views/border.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace ash {
+
+ContentsView::ContentsView() {
+  auto* layout = new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0);
+  SetLayoutManager(layout);
+
+  {

[James Cook, 2017/05/08 22:04:20]

any particular reason you're introducing new scopes here and below?

[jdufault, 2017/05/08 23:02:34]

Removed (I originally had a few more labels for testing but simplified on
upload, forgot to remove the braces).

+    views::Label* label = new views::Label();
+    label->SetBorder(views::CreateEmptyBorder(2, 3, 4, 5));
+    label->set_background(views::Background::CreateThemedSolidBackground(
+        label, ui::NativeTheme::kColorId_BubbleBackground));
+    label->SetText(base::ASCIIToUTF16("User"));
+    AddChildView(label);
+  }
+  {
+    unlock_button_ =
+        views::MdTextButton::Create(this, base::ASCIIToUTF16("Unlock"));
+    AddChildView(unlock_button_);
+  }
+}
+
+ContentsView::~ContentsView() {}
+
+void ContentsView::ButtonPressed(views::Button* sender,
+                                 const ui::Event& event) {
+  DCHECK(unlock_button_ == sender);
+
+  // TODO: Run mojo call that talks to backend which unlocks the device.
+  NOTIMPLEMENTED();
+}
+
+}  // namespace ash