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diff --git a/chrome/browser/ui/views/fullscreen_exit_bubble.h b/chrome/browser/ui/views/fullscreen_exit_bubble.h
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+++ b/chrome/browser/ui/views/fullscreen_exit_bubble.h
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+// Copyright (c) 2009 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_BROWSER_UI_VIEWS_FULLSCREEN_EXIT_BUBBLE_H__
+#define CHROME_BROWSER_UI_VIEWS_FULLSCREEN_EXIT_BUBBLE_H__
+#pragma once
+
+#include "app/slide_animation.h"
+#include "base/scoped_ptr.h"
+#include "base/timer.h"
+#include "chrome/browser/command_updater.h"
+#include "views/controls/link.h"
+
+#if defined(OS_LINUX)
+namespace views {
+class WidgetGtk;
+}
+#endif
+
+// FullscreenExitBubble is responsible for showing a bubble atop the screen in
+// fullscreen mode, telling users how to exit and providing a click target.
+// The bubble auto-hides, and re-shows when the user moves to the screen top.
+
+class FullscreenExitBubble : public views::LinkController,
+                             public AnimationDelegate {
+ public:
+  explicit FullscreenExitBubble(
+      views::Widget* frame,
+      CommandUpdater::CommandUpdaterDelegate* delegate);
+  virtual ~FullscreenExitBubble();
+
+ private:
+  class FullscreenExitView;
+  class FullscreenExitPopup;
+
+  static const double kOpacity;          // Opacity of the bubble, 0.0 - 1.0
+  static const int kInitialDelayMs;      // Initial time bubble remains onscreen
+  static const int kIdleTimeMs;          // Time before mouse idle triggers hide
+  static const int kPositionCheckHz;     // How fast to check the mouse position
+  static const int kSlideInRegionHeightPx;
+                                         // Height of region triggering slide-in
+  static const int kSlideInDurationMs;   // Duration of slide-in animation
+  static const int kSlideOutDurationMs;  // Duration of slide-out animation
+
+  // views::LinkController
+  virtual void LinkActivated(views::Link* source, int event_flags);
+
+  // AnimationDelegate
+  virtual void AnimationProgressed(const Animation* animation);
+  virtual void AnimationEnded(const Animation* animation);
+
+  // Called repeatedly to get the current mouse position and animate the bubble
+  // on or off the screen as appropriate.
+  void CheckMousePosition();
+
+  // Hides the bubble.  This is a separate function so it can be called by a
+  // timer.
+  void Hide();
+
+  // Returns the current desirable rect for the popup window.  If
+  // |ignore_animation_state| is true this returns the rect assuming the popup
+  // is fully onscreen.
+  gfx::Rect GetPopupRect(bool ignore_animation_state) const;
+
+  // The root view containing us.
+  views::View* root_view_;
+
+  // Someone who can toggle fullscreen mode on and off when the user requests
+  // it.
+  CommandUpdater::CommandUpdaterDelegate* delegate_;
+
+#if defined(OS_WIN)
+  // The popup itself, which is a slightly modified WidgetWin.  We need to use
+  // a WidgetWin (and thus an HWND) to make the popup float over other HWNDs.
+  FullscreenExitPopup* popup_;
+#elif defined(OS_LINUX)
+  views::WidgetGtk* popup_;
+#endif
+
+  // The contents of the popup.
+  FullscreenExitView* view_;
+
+  // Animation controlling sliding into/out of the top of the screen.
+  scoped_ptr<SlideAnimation> size_animation_;
+
+  // Timer to delay before allowing the bubble to hide after it's initially
+  // shown.
+  base::OneShotTimer<FullscreenExitBubble> initial_delay_;
+
+  // Timer to see how long the mouse has been idle.
+  base::OneShotTimer<FullscreenExitBubble> idle_timeout_;
+
+  // Timer to poll the current mouse position.  We can't just listen for mouse
+  // events without putting a non-empty HWND onscreen (or hooking Windows, which
+  // has other problems), so instead we run a low-frequency poller to see if the
+  // user has moved in or out of our show/hide regions.
+  base::RepeatingTimer<FullscreenExitBubble> mouse_position_checker_;
+
+  // The most recently seen mouse position, in screen coordinates.  Used to see
+  // if the mouse has moved since our last check.
+  gfx::Point last_mouse_pos_;
+
+  DISALLOW_COPY_AND_ASSIGN(FullscreenExitBubble);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FULLSCREEN_EXIT_BUBBLE_H__