Add the layout test case of ash/popup_message.

ash/popup_message_unittest.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 "ash/popup_message.h"
+
+#include "ash/test/ash_test_base.h"
+#include "base/strings/utf_string_conversions.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+
+typedef test::AshTestBase PopupMessageTest;
+
+// Verifies the layout of the popup, especially it does not crop the caption and
+// message text. See http://crbug.com/468494.
+TEST_F(PopupMessageTest, Layout) {
+  views::Widget* widget =
+      views::Widget::CreateWindowWithBounds(nullptr, gfx::Rect(0, 0, 100, 100));
+  PopupMessage message(base::ASCIIToUTF16("caption text"),
+                       base::ASCIIToUTF16(
+                           "Message text, which will be usually longer than "
+                           "the caption, so that it's wrapped at some width"),
+                       PopupMessage::ICON_WARNING,
+                       widget->GetContentsView() /* anchor */,
+                       views::BubbleBorder::TOP_LEFT, gfx::Size(), 10);
+
+  views::View* contents_view = message.widget_->GetContentsView();
+  views::View* caption_label =
+      contents_view->GetViewByID(PopupMessage::kCaptionLabelID);
+  views::View* message_label =
+      contents_view->GetViewByID(PopupMessage::kMessageLabelID);
+  ASSERT_TRUE(caption_label);
+  ASSERT_TRUE(message_label);
+
+  // The bubble should have enough heights to show both of the labels.
+  EXPECT_GE(contents_view->height(),
+            caption_label->height() + message_label->height());
+
+  // The labels are not cropped -- the assigned height has enough height to show
+  // the full text.
+  EXPECT_GE(caption_label->height(),
+            caption_label->GetHeightForWidth(caption_label->width()));
+  EXPECT_GE(message_label->height(),
+            message_label->GetHeightForWidth(message_label->width()));
+
+  message.Close();
+  widget->Close();
+}
+
+}  // namespace ash