MultiMonitor support

ash/monitor/monitor_controller.h

Index: ash/monitor/monitor_controller.h
diff --git a/ash/monitor/monitor_controller.h b/ash/monitor/monitor_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..52df5f7626c9401efd474e758545daa1785a5968
--- /dev/null
+++ b/ash/monitor/monitor_controller.h
@@ -0,0 +1,43 @@
+// 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.
+
+#ifndef ASH_MONITOR_MONITOR_CONTROLLER_H_
+#define ASH_MONITOR_MONITOR_CONTROLLER_H_
+#pragma once
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/aura/monitor_manager.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace ash {
+namespace internal {
+
+// MonitorController creates and maintains RootWindows for each
+// attached monitor, keeping them in sync with monitor configuration changes.
+class MonitorController : public aura::MonitorObserver {
+ public:
+  MonitorController();
+  virtual ~MonitorController();
+
+  // aura::MonitorObserver overrides:
+  virtual void OnMonitorBoundsChanged(const aura::Monitor* monitor) OVERRIDE;
+
+ private:
+  void Init();
+
+  std::map<const aura::Monitor*, aura::RootWindow*> root_windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(MonitorController);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_MONITOR_MONITOR_CONTROLLER_H_