Introduce RootWindowProperty for RootWindow's properties

ash/root_window_settings.h

Index: ash/root_window_settings.h
diff --git a/ash/root_window_settings.h b/ash/root_window_settings.h
new file mode 100644
index 0000000000000000000000000000000000000000..5dc3363f1e35b474df77ff2b5b052364ef20de16
--- /dev/null
+++ b/ash/root_window_settings.h
@@ -0,0 +1,52 @@
+// Copyright 2013 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_WM_ROOT_WINDOW_SETTINGS_H_
+#define ASH_WM_ROOT_WINDOW_SETTINGS_H_
+
+#include "ash/ash_export.h"
+#include "base/basictypes.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace ash {
+namespace internal {
+
+class RootWindowController;
+
+// Per root window information should be stored here
+// instead of using plain aura root window property because
+// it can prevent mis-using on non root window.
+struct RootWindowSettings {
+  RootWindowSettings();
+
+  // Indicate if the window in the active workspace should
+  // use the transparent "solo-window" header style.
+  bool solo_window_header;
+
+  // ID of the display associated with the root window.
+  int64 display_id;
+
+  // RootWindowController for the root window. This may be NULL
+  // for the root window used for mirroring.
+  RootWindowController* controller;
+};
+
+// Initializes and creates RootWindowSettings for |root|, and returns
+// the property.
+RootWindowSettings* InitRootWindowSettings(aura::RootWindow* root);
+
+// Returns the RootWindowSettings for |root|.
+ASH_EXPORT RootWindowSettings* GetRootWindowSettings(aura::RootWindow* root);
+
+// const version of GetRootWindowSettings.
+ASH_EXPORT const RootWindowSettings*
+GetRootWindowSettings(const aura::RootWindow* root);
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_ROOT_WINDOW_SETTINGS_H_