Move Fullscreen stuff onto FullscreenHandler type that hangs off NWW. This is the first step in mov…

ui/views/win/scoped_fullscreen_visibility.h

Index: ui/views/win/scoped_fullscreen_visibility.h
===================================================================
--- ui/views/win/scoped_fullscreen_visibility.h	(revision 0)
+++ ui/views/win/scoped_fullscreen_visibility.h	(revision 0)
@@ -0,0 +1,41 @@
+// 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 UI_VIEWS_WIN_SCOPED_FULLSCREEN_VISIBILITY_H_
+#define UI_VIEWS_WIN_SCOPED_FULLSCREEN_VISIBILITY_H_
+
+#include <windows.h>
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+
+// Scoping class that ensures a HWND remains hidden while it enters or leaves
+// the fullscreen state. This reduces some flicker-jank that an application UI
+// might suffer.
+class VIEWS_EXPORT ScopedFullscreenVisibility {
+ public:
+  explicit ScopedFullscreenVisibility(HWND hwnd);
+  ~ScopedFullscreenVisibility();
+
+  // Returns true if |hwnd| is currently hidden due to instance(s) of this
+  // class.
+  static bool IsHiddenForFullscreen(HWND hwnd);
+
+ private:
+  typedef std::map<HWND, int> FullscreenHWNDs;
+
+  HWND hwnd_;
+
+  static FullscreenHWNDs* full_screen_windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedFullscreenVisibility);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIN_SCOPED_FULLSCREEN_VISIBILITY_H_