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diff --git a/chrome/browser/ui/views/browser_bubble.h b/chrome/browser/ui/views/browser_bubble.h
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+++ b/chrome/browser/ui/views/browser_bubble.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_BROWSER_BUBBLE_H_
+#define CHROME_BROWSER_UI_VIEWS_BROWSER_BUBBLE_H_
+#pragma once
+
+#include "views/view.h"
+#include "views/widget/widget.h"
+
+class BrowserBubbleHost;
+
+// A class for creating a floating window that is "attached" to a particular
+// Browser.  If you don't install a delegate, the bubble will hide
+// automatically when the browser moves.  The bubble is only shown manually.
+// Users are expected to delete the bubble when finished with it.
+// Class assumes that RTL related mirroring is done by the view.
+class BrowserBubble {
+ public:
+  // Delegate to browser bubble events.
+  class Delegate {
+   public:
+    // Called when the Browser Window that this bubble is attached to moves.
+    virtual void BubbleBrowserWindowMoved(BrowserBubble* bubble) {}
+
+    // Called with the Browser Window that this bubble is attached to is
+    // about to close.
+    virtual void BubbleBrowserWindowClosing(BrowserBubble* bubble) {}
+
+    // Called when the bubble became active / got focus.
+    virtual void BubbleGotFocus(BrowserBubble* bubble) {}
+
+    // Called when the bubble became inactive / lost focus.
+    // |lost_focus_to_child| is true when a child window became active.
+    virtual void BubbleLostFocus(BrowserBubble* bubble,
+                                 bool lost_focus_to_child) {}
+  };
+
+  // Note that the bubble will size itself to the preferred size of |view|.
+  // |view| is the embedded view, |frame| is widget that the bubble is being
+  // positioned relative to, |origin| is the location that the bubble will
+  // be positioned relative to |frame|.  Pass true through |drop_shadow| to
+  // surround the bubble widget with a drop-shadow.
+  BrowserBubble(views::View* view, views::Widget* frame,
+                const gfx::Point& origin, bool drop_shadow);
+  virtual ~BrowserBubble();
+
+  // Call manually if you need to detach the bubble from tracking the browser's
+  // position.  Note that you must call this manually before deleting this
+  // object since it can't be safely called from the destructor.
+  void DetachFromBrowser();
+
+  // Normally called automatically during construction, but if DetachFromBrowser
+  // has been called manually, then this call will reattach.
+  void AttachToBrowser();
+  bool attached() const { return attached_; }
+
+  // Get/Set the delegate.
+  Delegate* delegate() const { return delegate_; }
+  void set_delegate(Delegate* del) { delegate_ = del; }
+
+  // Notifications from BrowserBubbleHost.
+  // With no delegate, both of these default to Hiding the bubble.
+  virtual void BrowserWindowMoved();
+  virtual void BrowserWindowClosing();
+
+  // Show or hide the bubble.
+  virtual void Show(bool activate);
+  virtual void Hide();
+  bool visible() const { return visible_; }
+
+  // The contained view.
+  views::View* view() const { return view_; }
+
+  // Set the bounds of the bubble relative to the browser window.
+  void SetBounds(int x, int y, int w, int h);
+  void MoveTo(int x, int y);
+  int width() { return bounds_.width(); }
+  int height() { return bounds_.height(); }
+  const gfx::Rect& bounds() const { return bounds_; }
+
+  // Reposition the bubble - as we are using a WS_POPUP for the bubble,
+  // we have to manually position it when the browser window moves.
+  void Reposition();
+
+  // Resize the bubble to fit the view.
+  void ResizeToView();
+
+  // Returns the NativeView containing that popup.
+  gfx::NativeView native_view() const { return popup_->GetNativeView(); }
+
+ protected:
+  // Create the popup widget.
+  virtual void InitPopup();
+
+  // Move the popup to an absolute position.
+  void MovePopup(int x, int y, int w, int h);
+
+  // The widget that this bubble is in.
+  views::Widget* popup_;
+
+  // The frame that this bubble is attached to.
+  views::Widget* frame_;
+
+ private:
+  // The view that is displayed in this bubble.
+  views::View* view_;
+
+  // The bounds relative to the frame.
+  gfx::Rect bounds_;
+
+  // Current visibility.
+  bool visible_;
+
+  // The delegate isn't owned by the bubble.
+  Delegate* delegate_;
+
+  // Is the bubble attached to a Browser window.
+  bool attached_;
+
+  // Does the bubble have a drop-shadow.
+  bool drop_shadow_enabled_;
+
+  // Non-owning pointer to the host of this bubble.
+  BrowserBubbleHost* bubble_host_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserBubble);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_BROWSER_BUBBLE_H_