Make win_aura work without ash.

ui/aura/desktop/desktop_screen_win.cc

+// Copyright (c) 2012 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 "ui/aura/desktop/desktop_screen_win.h"
+
+#include "base/logging.h"
+#include "ui/aura/desktop/desktop_screen.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura/root_window_host.h"
+#include "ui/gfx/monitor.h"
+
+namespace {
+
+MONITORINFO GetMonitorInfoForMonitor(HMONITOR monitor) {
+  MONITORINFO monitor_info = { 0 };
+  monitor_info.cbSize = sizeof(monitor_info);
+  GetMonitorInfo(monitor, &monitor_info);

[sky, 2012/04/26 19:15:18]

Check return value.

+  return monitor_info;
+}
+
+gfx::Monitor GetMonitor(MONITORINFO& monitor_info) {
+  // TODO(oshima): Implement ID and Observer.
+  gfx::Monitor monitor(0, gfx::Rect(monitor_info.rcMonitor));
+  monitor.set_work_area(gfx::Rect(monitor_info.rcWork));
+  return monitor;
+}
+
+}  // namespace
+
+namespace aura {
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopScreenWin, public:
+
+DesktopScreenWin::DesktopScreenWin() {
+}
+
+DesktopScreenWin::~DesktopScreenWin() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopScreenWin, gfx::ScreenImpl implementation:
+
+gfx::Point DesktopScreenWin::GetCursorScreenPoint() {
+  POINT pt;
+  GetCursorPos(&pt);
+  return gfx::Point(pt);
+}
+
+gfx::NativeWindow DesktopScreenWin::GetWindowAtCursorScreenPoint() {
+  POINT location;
+  gfx::AcceleratedWidget accelerated_widget =
+      GetCursorPos(&location) ? WindowFromPoint(location) : NULL;
+  RootWindowHost* host = NULL;
+  if (::IsWindow(accelerated_widget))
+    host = RootWindowHost::GetForAcceleratedWidget(accelerated_widget);
+  return host ? host->GetRootWindow() : NULL;
+}
+
+int DesktopScreenWin::GetNumMonitors() {
+  return GetSystemMetrics(SM_CMONITORS);
+}
+
+gfx::Monitor DesktopScreenWin::GetMonitorNearestWindow(
+    gfx::NativeView window) const {
+  gfx::AcceleratedWidget accelerated_window =
+      window->GetRootWindow()->GetAcceleratedWidget();
+  MONITORINFO monitor_info;
+  monitor_info.cbSize = sizeof(monitor_info);
+  GetMonitorInfo(MonitorFromWindow(accelerated_window,

[sky, 2012/04/26 19:15:18]

check return value.

+                                   MONITOR_DEFAULTTONEAREST),
+                 &monitor_info);
+  return GetMonitor(monitor_info);
+}
+
+gfx::Monitor DesktopScreenWin::GetMonitorNearestPoint(
+    const gfx::Point& point) const {
+  POINT initial_loc = { point.x(), point.y() };
+  HMONITOR monitor = MonitorFromPoint(initial_loc, MONITOR_DEFAULTTONEAREST);
+  MONITORINFO mi = {0};
+  mi.cbSize = sizeof(mi);
+  if (monitor && GetMonitorInfo(monitor, &mi))
+    return GetMonitor(mi);
+  return gfx::Monitor();
+}
+
+gfx::Monitor DesktopScreenWin::GetPrimaryMonitor() const {
+  MONITORINFO mi = GetMonitorInfoForMonitor(
+      MonitorFromWindow(NULL, MONITOR_DEFAULTTOPRIMARY));
+  gfx::Monitor monitor = GetMonitor(mi);
+  DCHECK_EQ(GetSystemMetrics(SM_CXSCREEN), monitor.size().width());
+  DCHECK_EQ(GetSystemMetrics(SM_CYSCREEN), monitor.size().height());
+  return monitor;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+gfx::ScreenImpl* CreateDesktopScreen() {
+  return new DesktopScreenWin;
+}
+
+}  // namespace aura