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diff --git a/chrome_frame/infobars/internal/infobar_window.h b/chrome_frame/infobars/internal/infobar_window.h
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+++ b/chrome_frame/infobars/internal/infobar_window.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_INFOBAR_WINDOW_H_
+#define CHROME_FRAME_INFOBARS_INTERNAL_INFOBAR_WINDOW_H_
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+#include "base/time.h"
+
+#include "chrome_frame/infobars/infobar_content.h"
+#include "chrome_frame/infobars/infobar_manager.h"
+
+struct FunctionStub;
+
+// Manages the display of an InfobarContent instance within a container window.
+// Positions the infobar content by displacing other "natural" content of the
+// window (see ReserveSpace). Allows positioning either above or below the
+// natural content.
+class InfobarWindow {
+ public:
+  // Integrates the InfobarWindow with its environment.
+  class Host {
+   public:
+    virtual ~Host() {}
+
+    // Returns a handle to the window within which infobar content should be
+    // created. All windows associated with the infobar content should be
+    // descendants of the container window.
+    virtual HWND GetContainerWindow() = 0;
+
+    // Triggers an immediate re-evaluation of the dimensions of the displaced
+    // content. InfobarWindow::ReserveSpace will be called with the natural
+    // dimensions of the displaced content.
+    virtual void UpdateLayout() = 0;
+  };  // class Host
+
+  explicit InfobarWindow(InfobarType type);
+  ~InfobarWindow();
+
+  void SetHost(Host* host);
+
+  // Shows the supplied content in this InfobarWindow. Normally,
+  // InfobarContent::InstallInFrame will be called with an InfobarContent::Frame
+  // instance the content may use to interact with the InfobarWindow.
+  //
+  // InfobarContent is deleted when the InfobarWindow is finished with the
+  // content (either through failure or when successfully hidden).
+  bool Show(InfobarContent* content);
+
+  // Hides the infobar.
+  void Hide();
+
+  // Receives the total space requested by the displaced content and subtracts
+  // any space required by this infobar. Passes the reserved dimensions to
+  // InfobarContent::SetDimensions.
+  void ReserveSpace(RECT* rect);
+
+ private:
+  // Provides InfobarContent with access to this InfobarWindow.
+  class FrameImpl : public InfobarContent::Frame {
+   public:
+    explicit FrameImpl(InfobarWindow* infobar_window);
+
+    // InfobarContent::Frame implementation
+    virtual HWND GetFrameWindow();
+    virtual void CloseInfobar();
+
+   private:
+    InfobarWindow* infobar_window_;
+    DISALLOW_COPY_AND_ASSIGN(FrameImpl);
+  };  // class FrameImpl
+
+  // Sets up our state to show or hide and calls Host::UpdateLayout to cause a
+  // call to ReserveSpace. Sets up a timer to periodically call UpdateLayout.
+  void StartSlidingTowards(int height);
+
+  // Based on the initial height, how long (and if) we have been sliding, and
+  // the target height, decides what the current height should be.
+  int CalculateHeight();
+
+  // Manage a timer that repeatedly calls Host::UpdateLayout
+  bool StartTimer();
+  void StopTimer();
+
+  scoped_ptr<InfobarContent> content_;
+  Host* host_;
+  FrameImpl frame_impl_;
+  InfobarType type_;
+  int current_width_;
+  int current_height_;
+
+  // These variables control our state for sliding and are used to calculate
+  // the desired height at any given time.
+  base::Time slide_start_;  // When we started sliding, or the null time if we
+                            // are not sliding.
+  int initial_height_;      // Where we started sliding from
+  int target_height_;       // Where we are sliding to
+
+  // ID and thunk for the slide-effect timer
+  int timer_id_;
+  FunctionStub* timer_stub_;
+
+  DISALLOW_COPY_AND_ASSIGN(InfobarWindow);
+};  // class InfobarWindow
+
+#endif  // CHROME_FRAME_INFOBARS_INTERNAL_INFOBAR_WINDOW_H_