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diff --git a/chrome_frame/infobars/internal/host_window_manager.h b/chrome_frame/infobars/internal/host_window_manager.h
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+++ b/chrome_frame/infobars/internal/host_window_manager.h
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+// Copyright (c) 2010 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 CHROME_FRAME_INFOBARS_INTERNAL_HOST_WINDOW_MANAGER_H_
+#define CHROME_FRAME_INFOBARS_INTERNAL_HOST_WINDOW_MANAGER_H_
+
+#include "base/basictypes.h"
+#include "chrome_frame/infobars/internal/subclassing_window_with_delegate.h"
+
+class DisplacedWindowManager;
+
+// HostWindowManager observes the HWND passed to Initialize and:
+// 1) Monitors the lifecycle of a specific child window (as identified by
+//    FindDisplacedWindow).
+// 2) Intercepts NCCALCSIZE events on the child window, allowing the client to
+//    modify the child window's requested dimensions.
+// 3) Allows the client to request a recalculation of the child window's
+//    dimensions (resulting in a callback as in [2]).
+//
+// See documentation of SubclasingWindowWithDelegate for further information.
+class HostWindowManager
+    : public SubclassingWindowWithDelegate<HostWindowManager> {
+ public:
+  HostWindowManager();
+  virtual ~HostWindowManager();
+
+  // Triggers an immediate re-evaluation of the dimensions of the displaced
+  // window. Delegate::AdjustDisplacedWindowDimensions will be called with the
+  // natural dimensions of the displaced window.
+  void UpdateLayout();
+
+ private:
+  class DisplacedWindowDelegate;
+  friend class DisplacedWindowDelegate;
+
+  // Finds the window to be displaced and instantiate a DisplacedWindowManager
+  // for it if one does not already exist. Returns true if
+  // displaced_window_manager_ is non-NULL at the end of the call.
+  bool FindDisplacedWindow(HWND old_window);
+
+  // Subclasses and observes changes to the displaced window.
+  DisplacedWindowManager* displaced_window_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(HostWindowManager);
+};  // class HostWindowManager
+
+#endif  // CHROME_FRAME_INFOBARS_INTERNAL_HOST_WINDOW_MANAGER_H_