Move DisplayUtils methods into gfx::Screen.

ui/gfx/screen_unittest.cc

+// Copyright (c) 2011 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 "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/screen.h"
+
+#if defined(USE_AURA)
+#include "base/message_loop.h"
+#include "ui/aura/desktop.h"
+#endif
+
+namespace {
+
+#if defined(USE_AURA)
+class ScreenTest : public testing::Test {
+ public:
+  ScreenTest() {
+    aura::Desktop::GetInstance()->ShowDesktop();
+  }
+
+  virtual ~ScreenTest() {
+    aura::Desktop::GetInstance()->DeleteInstanceForTesting();
+  }
+
+ private:
+  MessageLoopForUI message_loop_;
+};
+#else
+typedef testing::Test ScreenTest;
+#endif
+
+TEST_F(ScreenTest, GetPrimaryMonitorSize) {
+  // We aren't actually testing that it's correct, just that it's sane.
+  const gfx::Size size = gfx::Screen::GetPrimaryMonitorSize();
+  EXPECT_GE(size.width(), 1);
+  EXPECT_GE(size.height(), 1);
+}
+
+TEST_F(ScreenTest, GetNumMonitors) {
+  // We aren't actually testing that it's correct, just that it's sane.
+  EXPECT_GE(gfx::Screen::GetNumMonitors(), 1);
+}
+
+}  // namespace