Implement Screen::GetAllDisplays for windows.

ui/gfx/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/gfx/screen_win.h"
 
 #include <windows.h>
 
 #include "base/hash.h"
 #include "base/logging.h"
@@ skipping 15 matching lines @@
 gfx::Display GetDisplay(MONITORINFOEX& monitor_info) {
   // TODO(oshima): Implement Observer.
   int64 id = static_cast<int64>(base::Hash(WideToUTF8(monitor_info.szDevice)));
   gfx::Rect bounds = gfx::Rect(monitor_info.rcMonitor);
   gfx::Display display(id, bounds);
   display.set_work_area(gfx::Rect(monitor_info.rcWork));
   display.SetScaleAndBounds(ui::win::GetDeviceScaleFactor(), bounds);
   return display;
 }
 
+BOOL CALLBACK EnumMonitorCallback(HMONITOR monitor,
+                                  HDC hdc,
+                                  LPRECT rect,
+                                  LPARAM data) {
+  std::vector<gfx::Display>* all_displays =
+      reinterpret_cast<std::vector<gfx::Display>*>(data);
+  DCHECK(all_displays);
+
+  MONITORINFOEX monitor_info = GetMonitorInfoForMonitor(monitor);
+  gfx::Display display = GetDisplay(monitor_info);
+  all_displays->push_back(display);
+  return TRUE;
+}
+
 }  // namespace
 
 namespace gfx {
 
 ScreenWin::ScreenWin() {
 }
 
 ScreenWin::~ScreenWin() {
 }
 
@@ skipping 15 matching lines @@
 
 gfx::NativeWindow ScreenWin::GetWindowAtScreenPoint(const gfx::Point& point) {
   return GetNativeWindowFromHWND(WindowFromPoint(point.ToPOINT()));
 }
 
 int ScreenWin::GetNumDisplays() const {
   return GetSystemMetrics(SM_CMONITORS);
 }
 
 std::vector<gfx::Display> ScreenWin::GetAllDisplays() const {
-  NOTIMPLEMENTED();
-  return std::vector<gfx::Display>(1, GetPrimaryDisplay());
+  std::vector<gfx::Display> all_displays;
+  EnumDisplayMonitors(NULL, NULL, EnumMonitorCallback,
+                      reinterpret_cast<LPARAM>(&all_displays));
+  return all_displays;
 }
 
 gfx::Display ScreenWin::GetDisplayNearestWindow(gfx::NativeView window) const {
   HWND window_hwnd = GetHWNDFromNativeView(window);
   if (!window_hwnd) {
     // When |window| isn't rooted to a display, we should just return the
     // default display so we get some correct display information like the
     // scaling factor.
     return GetPrimaryDisplay();
   }
@@ skipping 63 matching lines @@
 #endif  // USE_AURA
 }
 
 #if !defined(USE_AURA)
 Screen* CreateNativeScreen() {
   return new ScreenWin;
 }
 #endif  // !USE_AURA
 
 }  // namespace gfx