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diff --git a/chrome/browser/ui/views/dropdown_bar_host.h b/chrome/browser/ui/views/dropdown_bar_host.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_BROWSER_UI_VIEWS_DROPDOWN_BAR_HOST_H_
+#define CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_HOST_H_
+#pragma once
+
+#include "app/animation_delegate.h"
+#include "base/scoped_ptr.h"
+#include "chrome/common/native_web_keyboard_event.h"
+#include "gfx/native_widget_types.h"
+#include "gfx/rect.h"
+#include "views/controls/textfield/textfield.h"
+#include "views/focus/focus_manager.h"
+
+class BrowserView;
+class DropdownBarView;
+class SlideAnimation;
+class TabContents;
+
+namespace views {
+class ExternalFocusTracker;
+class View;
+class Widget;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The DropdownBarHost implements the container widget for the UI that
+// is shown at the top of browser contents. It uses the appropriate
+// implementation from dropdown_bar_host_win.cc or dropdown_bar_host_gtk.cc to
+// draw its content and is responsible for showing, hiding, animating, closing,
+// and moving the bar if needed, for example if the widget is
+// obscuring the selection results in FindBar.
+//
+////////////////////////////////////////////////////////////////////////////////
+class DropdownBarHost : public views::AcceleratorTarget,
+                        public views::FocusChangeListener,
+                        public AnimationDelegate {
+ public:
+  explicit DropdownBarHost(BrowserView* browser_view);
+  virtual ~DropdownBarHost();
+
+  // Initializes the dropdown bar host with the give view.
+  void Init(DropdownBarView* view);
+
+  // Whether we are animating the position of the dropdown widget.
+  bool IsAnimating() const;
+  // Returns true if the dropdown bar view is visible, or false otherwise.
+  bool IsVisible() const;
+  // Selects text in the entry field and set focus.
+  void SetFocusAndSelection();
+  // Stops the animation.
+  void StopAnimation();
+
+  // Shows the dropdown bar.
+  virtual void Show(bool animate);
+  // Hides the dropdown bar.
+  virtual void Hide(bool animate);
+
+  // Returns the rectangle representing where to position the dropdown widget.
+  virtual gfx::Rect GetDialogPosition(gfx::Rect avoid_overlapping_rect) = 0;
+
+  // Moves the widget to the provided location, moves it to top
+  // in the z-order (HWND_TOP, not HWND_TOPMOST for windows) and shows
+  // the widget (if hidden).
+  virtual void SetDialogPosition(const gfx::Rect& new_pos, bool no_redraw) = 0;
+
+  // Overridden from views::FocusChangeListener:
+  virtual void FocusWillChange(views::View* focused_before,
+                               views::View* focused_now);
+
+  // Overridden from views::AcceleratorTarget:
+  virtual bool AcceleratorPressed(const views::Accelerator& accelerator) = 0;
+
+  // AnimationDelegate implementation:
+  virtual void AnimationProgressed(const Animation* animation);
+  virtual void AnimationEnded(const Animation* animation);
+
+  // During testing we can disable animations by setting this flag to true,
+  // so that opening and closing the dropdown bar is shown instantly, instead of
+  // having to poll it while it animates to open/closed status.
+  static bool disable_animations_during_testing_;
+
+  // Returns the browser view that the dropdown belongs to.
+  BrowserView* browser_view() const { return browser_view_; }
+
+  // Registers this class as the handler for when Escape is pressed. Once we
+  // loose focus we will unregister Escape and (any accelerators the derived
+  // classes registers by using overrides of RegisterAccelerators). See also:
+  // SetFocusChangeListener().
+  virtual void RegisterAccelerators();
+
+  // When we loose focus, we unregister all accelerator handlers. See also:
+  // SetFocusChangeListener().
+  virtual void UnregisterAccelerators();
+
+ protected:
+  // Returns the dropdown bar view.
+  DropdownBarView* view() const { return view_; }
+
+  // Returns the focus tracker.
+  views::ExternalFocusTracker* focus_tracker() const {
+    return focus_tracker_.get();
+  }
+
+  // Resets the focus tracker.
+  void ResetFocusTracker();
+
+  // The focus manager we register with to keep track of focus changes.
+  views::FocusManager* focus_manager() const { return focus_manager_; }
+
+  // Returns the host widget.
+  views::Widget* host() const { return host_.get(); }
+
+  // Returns the animation offset.
+  int animation_offset() const { return animation_offset_; }
+
+  // Retrieves the boundary that the dropdown widget has to work with
+  // within the Chrome frame window. The boundary differs depending on
+  // the dropdown bar implementation. The default implementation
+  // returns the boundary of browser_view and the drop down
+  // can be shown in any client area.
+  virtual void GetWidgetBounds(gfx::Rect* bounds);
+
+  // The find bar widget needs rounded edges, so we create a polygon
+  // that corresponds to the background images for this window (and
+  // make the polygon only contain the pixels that we want to
+  // draw). The polygon is then given to SetWindowRgn which changes
+  // the window from being a rectangle in shape, to being a rect with
+  // curved edges. We also check to see if the region should be
+  // truncated to prevent from drawing onto Chrome's window border.
+  void UpdateWindowEdges(const gfx::Rect& new_pos);
+
+  // Creates and returns the native Widget.
+  views::Widget* CreateHost();
+
+  // Allows implementation to tweak widget position.
+  void SetWidgetPositionNative(const gfx::Rect& new_pos, bool no_redraw);
+
+  // Returns a keyboard event suitable for fowarding.
+  NativeWebKeyboardEvent GetKeyboardEvent(
+      const TabContents* contents,
+      const views::Textfield::Keystroke& key_stroke);
+
+  // Returns the animation for the dropdown.
+  SlideAnimation* animation() {
+    return animation_.get();
+  }
+
+ private:
+  // The BrowserView that created us.
+  BrowserView* browser_view_;
+
+  // Our view, which is responsible for drawing the UI.
+  DropdownBarView* view_;
+
+  // The y position pixel offset of the widget while animating the
+  // dropdown widget.
+  int animation_offset_;
+
+  // The animation class to use when opening the Dropdown widget.
+  scoped_ptr<SlideAnimation> animation_;
+
+  // The focus manager we register with to keep track of focus changes.
+  views::FocusManager* focus_manager_;
+
+  // True if the accelerator target for Esc key is registered.
+  bool esc_accel_target_registered_;
+
+  // Tracks and stores the last focused view which is not the DropdownBarView
+  // or any of its children. Used to restore focus once the DropdownBarView is
+  // closed.
+  scoped_ptr<views::ExternalFocusTracker> focus_tracker_;
+
+  // Host is the Widget implementation that is created and maintained by the
+  // dropdown bar. It contains the DropdownBarView.
+  scoped_ptr<views::Widget> host_;
+
+  // A flag to manually manage visibility. GTK/X11 is asynchrnous and
+  // the state of the widget can be out of sync.
+  bool is_visible_;
+
+  DISALLOW_COPY_AND_ASSIGN(DropdownBarHost);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_HOST_H_