[Athena] minimum impl to add screen/background and test windows

athena/main/placeholder.cc

+// Copyright 2014 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 "athena/main/placeholder.h"
+
+#include "athena/screen/public/screen_manager.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/utf_string_conversions.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/views/background.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/painter.h"
+#include "ui/views/widget/widget.h"
+
+void CreateTestWindows() {
+  views::Widget* test_app_widget = new views::Widget;
+  // Athena doesn't have frame yet.
+  views::Widget::InitParams params(
+      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+  params.context = athena::ScreenManager::Get()->GetContext();
+  test_app_widget->Init(params);
+  views::Label* label = new views::Label;
+  label->SetText(base::ASCIIToUTF16("AppWindow"));
+  label->set_background(
+      views::Background::CreateSolidBackground(SK_ColorWHITE));
+  test_app_widget->SetContentsView(label);
+  test_app_widget->Show();
+}
+
+void SetupBackgroundImage() {
+  gfx::Size size(200, 200);
+  gfx::Canvas canvas(size, 1.0f, true);
+  scoped_ptr<views::Painter> painter(
+      views::Painter::CreateVerticalGradient(SK_ColorBLUE, SK_ColorCYAN));
+  painter->Paint(&canvas, size);
+  athena::ScreenManager::Get()->SetBackgroundImage(
+      gfx::ImageSkia(canvas.ExtractImageRep()));
+}